Rf switch driver circuit

How and why to use pin diodes for rf switching digikey. Moca frontend integrated circuits high power switch and bias module. Vcc driver section supply voltage power supply input for the driver output section. Vaunix lsw series lab brick rf and microwave programmable switches offer high isolation, solidstate switching for wireless testing in both single pole double throw spdt and single pole four throw sp4t configurations. A gaas high speed driver circuit for rf switches ieee xplore. Rf circuit the three most common circuit configurations are 1 singlepoledoublethrow spdt, 2 transfer dpdt, and 3 multiposition select the simplest circuit to meet system requirements. Ultrareliable mechanical switches capable of extended life up to 10million switch cycles.

Switches are an important part of most electronic circuits. Basic properties of pin diode and fets in rf switching applications. Chapter 2, the common pin diode switch configurations are presented, followed by sections comparing those features of pin diode switch designs for unique to high power microwave switches and high power lower frequency rfband switches. The driver circuit that is needed for pin diodes almost precludes the use of. Pin diode drive circuits optimized for fast switching master of science thesis christoffer brorsson. Part number brand vcc v vee v icc ma risefall time ns iee ma probogation delay ns compare cart. Use adapter cable 1176460011 with 87a switch driver warning. Ask transmitter is used transmit the signal generated in the circuit via radio frequency 433mhz. Rf em or ss switches come in a variety of package sizes and connector configurations. The fastest switch driver circuits use discrete transistors. The f2914 is a high reliability, low insertion loss, 50. How rf switch works rf switch equivalent circuits pin diode,fet. Typical switch fets need zero volts to turn on, and 5 volts to turn off to be pinched off. Using the ethernet interface the switch matrices can be controlled from any computer with an internet connection, or even your smartphone from almost anywhere.

Every pin diode in a switching circuit has an accompanying pin diode driver or. Infineon offers a variety of rf switches for mobile applications like 3g4g. Here, the simple rf switching circuit is used to turn on and turn off an led for demonstration you can replace the led with a switching relay and control any appliances. It is capable of delivering peak currents in excess of one ampere at speeds up to 10 mhz. We know that switches are used in electrical, mechanical, electronics and communication industries for switching of signals. Relays are one of the most important components in electronic circuits. Cordless and mobile phones, cellular base stationswireless infrastructure, satellite radio, gps and dab, 2. The focus of this topic is the gate drive requirements of the power mosfet in various switch mode power conversion applications. Incorporating a switch into a switch matrix system enables you to route signals from multiple instruments to single or multiple duts. Jan 22, 2020 in this article we will comprehensively study a transistor relay driver circuit and learn how to design its configuration by calculating the parameters through formulas.

Drivers are typically used to translate ttl control voltages for rf and microwave attenuators and switches. The resistance value for the discharge circuit must be 1 m. It is used to switch high loads or loads that needs ac current to operate. Homebrew rf circuit design ideas there is no such thing as a new idea. The pin diode circuit designers handbook the pin diode circuit designers handbook was written for the microwave and rf design engineer. The bias circuit typically uses a lowpass filter between the rf circuit and the switch driver. Because the bias, rf, and switchdriver circuits all interact and affect each.

Jul 21, 2016 technical article rapid analysis of bjt switchdriver circuits july 21, 2016 by robert keim this technical brief explains a quick, straightforward procedure for evaluating a switchdriver circuit based on an npn bipolar junction transistor. Two relays were used to build the required circuit and in this video, a. In a radar system the switch directs transmit and receive signals to and. Microot specialty in dc40ghz broadband high power120wspst,spdt,sp3t,sp4t,sp6t,sp8t rf switch etc. An rf receiver is a simple circuit that consists of an rf tuned circuit, an amplifier circuit, and a phase lock loop circuit. The most popular circuit solutions and their performance are analyzed, including the effect of parasitic.

The low rc product and low profile of the tiny beamlead package minimizes parasitics for. Most coaxial switch designs use sma connectors for operation up to 26 ghz. The product is designed for ac voltage operation with two output channels, a and b. An amplifier circuit is used to amplify a particular frequency from all. Often the biggest limitation on switching speed is the driver circuit.

It mentions how rf switch works along with its equivalent circuits. Usbethernet rf switches are light, compact and greatly simplify setting up complex switching sequences. Pin diode drivers introduction the dh0035dh0035c is a ttldtl compatible, dc coupled, high speed pin diode driver. A lowpower antenna switch driver circuit with rf leakage suppression and fast switching time is implemented in a 0. This type of switch is widely used in signal routing applications where high frequency, high power. Select the simplest circuit to meet system requirements. The pin diode spdt rf switch and fet based rf switch use cases or examples are explained.

The switch matrix then employs a driver circuit and power supply to power and drive the switches and signal conditioners. Pdf highspeed highvoltage pin diode driver researchgate. Highspeed analog cmos technology is used to achieve low power consumption at moderate speeds. This device covers a broad frequency range from 50 mhz to 8000 mhz. Switches are mechanical devices with two or more leads or terminals that are. Guide to selecting a coaxial switch a coaxial switch is an electromechanical relay. The driver circuit that is needed for pin diodes almost precludes the use of this technology on volumelimited applications such as tr modules, where element spacing is less than the width of available diode driver circuits. Sp4t absorptive rf switch designed for a multitude of wireless and other rf applications. Basic transistor relay driver, actuated on high input npn this circuit will drive a relay coil from a low power output, usually from an ic like 555 or a ttlcmos.

Spdt, dpdt transfer, sp4t, sp6t, sp8t, and sp10t mechanical and solid state rf switches for 50ohm and 75ohm systems spanning dc to 40 ghz. Upper and lower frequency limits for the three groups of solidstate rf switch components. We can switch channel a with the a button in the remote control handset and channel b with the b button. Rapid analysis of bjt switchdriver circuits technical. Solidstate switches with extremely fast switching times. Low output resistances allow it to develop high output current spikes to ensure fast switching speeds. Mems, fet and pin rf switching devices and circuits for.

Rf radio frequency and microwave switches are used extensively in microwave test systems for signal routing between instruments and devices under test dut. The information in this chapter is presented as a guide for the rf switch switch driver interface. Low cost solid state rf switches with high isolation and. Minicircuits is a global leader in the design and manufacturing of rf, if, and microwave components from dc to 86ghz. Rf circuit the three most common circuit configurations are 1 singlepoledoublethrow spdt, 2 transfer dpdt, and 3 multiposition. We simply take a lot of old ideas and put them into a sort of mental kaleidoscope. Some ss switch designs have integrated drivers with ttl logic states available for specific control functions.

Rf turnon was accomplished in 1012 ns while turnoff took approximately 5 ns, as shown in figure no target for. An rf switch or microwave switch is a device to route high frequency signals through transmission paths. Figure 5 shows a singlepole doublethrow spdt rf switch and its bias circuit. May 06, 2015 the ttl driver supplies all the necessary currents to ensure diodes have either reverse or forward bias voltage. This article demonstrates how the dh0035 may be applied to driving pin diodes and comparable loads which. These lowcost, portable units are powered and controlled via a usb port connection to any pc or powered hub. If there is no discharge circuit, the switch will not turn off. Install a discharge circuit in the switch drive circuit.

Input signal to the dm8830 was a 5v peak, 100 khz, 5 s wide pulse train. Two relays were used to build the required circuit and in this video, a 2. References 1,2 provide a fuller treatment of this subject and can be used as a basis for rf switch switch driver interface designs. Low cost solid state rf switches with high isolation and usb. Broadband high power 120w rf switch powered by cmseasy.

Cmos switch drivers macom partners from rf to light. New products and enhancements mean these numbers are constantly in flux. How rf switch works rf switch equivalent circuits pin. The rf contact configuration is designed for controlled wiping action. Another important feature to consider with ss switches is the driver circuit. Consider the following parameters to select the most suitable switch for a specific application. Lowpower soi cmos antenna switch driver circuit with rf leakage. Here we will compare driver circuits for pin diodes with those needed for switch fets. Switching rf power in portable applications is challenging for electromechanical switches due to size, cost and speed considerations. The switch matrix is made up of rf switches and signal conditioners that are mounted together in a mechanical infrastructure or housing.

The circuit of figure 7was breadboarded and tested in conjunction with a hewlettpackard 33622a pin diode. Cables then interconnect the switches and signal conditioners. How to make simple rf onoff switch all about circuits. Transistor relay driver circuit with formula and calculations. Fundamentals of mosfet and igbt gate driver circuits application report. Macoms cmos switch drivers are used extensively in wireless infrastructure base stations as well as aerospace and defense applications.

In the simplest case, most circuits contain an onoff switch. Fet switch driver examples remember that the fets used in switches are depletionmode devices. Driver circuits for high power pin diode switches the information in this chapter is presented as a guide for the rf switch switch driver interface. The left circuit will switch on the load when the ldr is in dark. An rf tuner is used to tune the circuit to a particular frequency, which needs to meet the transmitted frequency.

This video demonstrates the simple way to control the direction of a dc motor which in this case a 12v car power window. Driver circuits often take on additional functions which include isolating the control circuit and the power circuit, detecting malfunctions, storing and reporting failures to the control system, serving as a precaution against failure, analyzing sensor signals, and creating auxiliary voltages. In this article we will comprehensively study a transistor relay driver circuit and learn how to design its configuration by calculating the parameters through formulas. Sep 08, 2016 this video demonstrates the simple way to control the direction of a dc motor which in this case a 12v car power window. These leads provide power to the output section of the deic515 driver. The driver ic has very low power requirements, and is compatible with standard cmos logic drive voltages. The simplest rf switch is a regular switch with a voltage resistor line that forward biases an rf signal diode.

The use of rf and microwave switches based on pin diodes is widely spread. This is assuming that you only want to turn a rf signal line on and off. Fundamentals of mosfet and igbt gate driver circuits. Pin diode drive circuits optimized for fast switching. There are many unique market applications, such as the wireless communications market, where new. Rapid analysis of bjt switchdriver circuits technical articles. Macoms madr007097000100 is a spdt driver used to interface between ttl logic signals and pin diode based microwave switches. The ttl driver supplies all the necessary currents to ensure diodes have either reverse or forward bias voltage. Abstract the use of rf and microwave switches based on pin diodes is widely spread. Driver circuits powerguru power electronics information. An object is created driver to access the commands used for sending and. The keysight 117a attenuatorswitch driver provides gpib or local front panel drive control for programmable attenuators and electromechanical switches.

In addition to actual diode parameters, package parasitics play a significant role in determining switch circuit performance. The device can switch a 4 pf load through 10 volts in less than 2 ns. Driver circuits often take on additional functions which include isolating the control circuit and the power circuit, detecting malfunctions, storing and reporting failures to the control system, serving as a precaution against failure, analyzing sensor signals, and. Drivers for gaas fet switches and digital attenuators pdf file. The new 117b attenuatorswitch driver is a direct replacement.

While pin diodes offer some unique advantages relative to other nonmechanical options such as cmos switches and mems structures, they are difficult to design into a circuit unless their characteristics are clearly understood. For more information on new features and backwards compatibility, please see the keysight 117bc attenuatorswitch driver. Transistor switching for rf is much more complicated. A guide to rf switching systems whether you are designing an rf switching system or planning to purchase one, it is. This page covers most common rf switch applications or rf switch uses. Connecting the switch driver control circuit to a pin diode such that it can turn diodes on and off by applying a forward or reverse bias is a challenging task. This paper describes a high speed driver circuit for gaas mmic r. It is a 4 pin device, the pin configuration is shown in the figure. Technical article rapid analysis of bjt switchdriver circuits july 21, 2016 by robert keim this technical brief explains a quick, straightforward procedure for evaluating a switchdriver circuit based on an npn bipolar junction transistor.

Here we will learn the basics of rf module and how to use it as a standalone rf transmitter and receiver. As we said before, the 74hct04 hex inverter is good for maybe 10 nanoseconds as a fet switch driver. In addition to the onoff switch, many circuits contain switches that control how the circuit works or activate different features of the circuit. Here we have explained the rf transmitter and receiver circuit by controlling the leds wirelessly using rf.

Fundamentals of mosfet and igbt gate driver circuits application report slua618amarch 2017revised october 2018 fundamentals of mosfet and igbt gate driver circuits laszlobalogh abstract the main purpose of this application report is to demonstrate a systematic approach to design high. The result is that the fets are rf grounded but a positive dc voltage is injected. Minicircuits is a global leader in the design and manufacturing of rf, if, and microwave. An rf module, which is a radio frequency module consists of two modules, one which receives the data called receiver, and the one which transmits the data called transmitter.