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High Frequency Amplifier / High Speed Circuits / Wide Band Amplifier Circuits
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Amplifier -- Main Page
 

Last Updated: November 30, 2017 07:37 AM

Circuits Designed by Dave Johnson, P.E. :
Laser Light Detyector-10Mhz to 20Mhz  -  This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system.  It has good ambient light immunity . . . Hobby Circuit designed by Dave Johnson P.E.-June 14, 2000

Light Receiver-10MHz to 20MHz  -  Light power to volts conversion = APPROX.15mV per microwatt at 850nM . . . Hobby Circuit designed by David A. Johnson P.E.-July 11, 2006

N-Ch & P-Ch Transistor Form Push-Pull Driver  -  This circuit can produce high speed output signals with fast rise and full times.  The unique change pump action allows the voltage of the upper P-ch device to range from millivolts to hundreds of volts.  The output current is only limited by the rating of . . . Circuit by Dave Johnson P.E.-June 27, 2000

Optical Fiber Receiver-5Mhz Broad Band  -  This circuit is a simple broad band light detector that uses a very inexpensive IC and a PIN photodiode that is packaged for use with plastic optical fibers.  It has a bandwidth from 1KHz to over 5MHz.  It is great for experimenting with various modulated . . . Hobby Circuit designed by David Johnson P.E.-June 04, 2000

Tester for Brown Out Voltage  -  Using a cheap 24vac transformer, this circuit can test a product under low 95vac conditions.    With the components show, it has a rating of 250 watts max.   . . . Circuit by Dave Johnson P.E.-July 11, 2006

Wide Band Zero Cross Detector  -  This circuit was designed to convert a low amplitude 40KHz signal into a clean square wave signal.  It will work with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak.  The input frequency can range from a few kilohertz to about 150 . . . Circuit by Dave Johnson P.E.-July 18, 2000


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Large Area Photodiode Bootstrapping -  Large area photodiodes come with a large capacitance, typically on the order of 3000pF or larger.  This capacitance to ground at the input of a transimpedance amplifier has a significant effect on the output noise of the circuit as the noise gain increases dramatically at higher frequencies. __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Laser Light Detyector-10Mhz to 20Mhz -  This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system.  It has good ambient light immunity . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

LF Block Converter -  This converter shifts the VLF/LF bands, from below 20 kHz to over 350 kHz to the shortwave frequencies, determined by the selected crystal. __ Contact: Charles Wenzel of Wenzel Associates, Inc.

LF dB Output meter -  Ham RadioOther __ Designed by Guy Roels ON6MU

LF to HF Converter -  This converter allows reception of signals below 500 kHz on a 3.5 4 MHz HF receiver.    It should therefore be useful for those with receivers that do not receive the lower frequencies.  amateur radio construction projects. __ Designed by Peter Parker

Light Receiver-10MHz to 20MHz -  Light power to volts conversion = APPROX.15mV per microwatt at 850nM . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Low Noise Low Power DC Accurate Single Supply Photodiode Amplifier -  A low noise JFET Q1 acts as a current buffer, with R2 and R3 imposing a low frequency gain of approximately 1. __ Linear Technology/Analog Devices App Note, Mar 22, 2010

Low Noise, Low Power Photodiode Amplifier -  Low Noise, Low Power Photodiode Amplifier is Better than Monolithics.  Low Bias Current, Low Current Noise and Unity Gain Stability Keep the Circuit Operational from 0ohm to several Gohm.  Amplifier input noise density and gain-bandwidth product were measured to be 2.4nV/rtHz and 100MHz, respectively, with only 3.8mA supply __ Linear Technology/Analog Devices App Note, Mar 22, 2010

LTC6945 Wideband Point-to-Point Radio Local Oscillator -  The LTC6945 is a high performance, low noise, 6GHz phase locked loop (PLL) , including a reference divider, phase frequency detector (PFD) with phase-lock indicator, charge pump, integer feedback divider and VCO output divider.  The part features a buffered, programmable VCO output divider with a range of 1 through 6.  The differential, __ Linear Technology/Analog Devices App Note, Jan 16th 2012

Medium Power Wideband Amplifier for MMDS Applications 5/30/98  -  App Note  Doc #911 __ California Eastern Laboratories

Micropower 1MHz V/F Converter -  A 0V to 5V input produces a 0MHz to 1MHz output frequency. __ Linear Technology/Analog Devices App Note, Jun 21, 2011

N-Ch & P-Ch Transistor Form Push-Pull Driver -  This circuit can produce high speed output signals with fast rise and full times.  The unique change pump action allows the voltage of the upper P-ch device to range from millivolts to hundreds of volts.  The output current is only limited by the rating of. . . Circuit by Dave Johnson P.E.-June, 2000

One transistor HF/VHF/UHF preamp using one BSX-20 transistor -  The MAR6 (MSA-0686, 0685, 0885) is a high performance silicon bipolar Monolithic Microwave Integrated Circuit (MMIC) housed in a low cost, surface mount plastic package. 
This MMIC is designed for use as a general purpose 50 W gain block.  Applications include narrow and broad band IF and RF amplifiers in commercial and industrial applications. __ Designed by Guy Roels ON6MU

One Watt Class-C Amplifier -  Schematic only, no circuit description __ Designed by 2001YO5OFH, Csaba Gajdos

Optical Fiber Receiver-5Mhz Broad Band -  This circuit is a simple broad band light detector that uses a very inexpensive IC and a PIN photodiode that is packaged for use with plastic optical fibers.  It has a bandwidth from 1KHz to over 5MHz.  It is great for experimenting with various modulated . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

QRP HF Transmitter -  I am unable to use packet radio here in Sweden because a SYSOP will not allow me to use FBB software for a PMS system.  As a result all mail to and from me is deleted.  The solution is quite simple, log on to a BBS in another country via HF where they know how to set up a packet system __ Designed by Harry Lythall-SM0VPO

RGB to YPBPR Component-Video Conversion -  Figure 15 shows a method of generating the standard definition YPBPR signals from an RGB source using a pair of LT6550 triple amplifiers.  It should be noted that to ensure Y includes a correct sync, correct syncs should be present at all three inputs or else added directly at the Y output gated 8.5mA current sink or 350Ω __ Linear Technology/Analog Devices App Note, Mar 25th 2010

Single 2.7V Supply 4MHz 4th Order Lowpass Butterworth Filter -  Benefiting from low voltage operation and rail-to-rail output, a low power filter that is suitable for antialiasing can be built as shown in this circuit.  On a 2.7V supply the filter has a paSSBand of approximately 4MHz with 2VP-P input signal and a stopband attenuation that is greater than 75dB at 43MHz.  The resistor and __ Linear Technology/Analog Devices App Note, Jul 20th 2010

Single Ended to Differential Transimpedance Amplifier -  This circuit shows the LTC6406 connected as a single-ended transimpedance amplifier with 20kΩ of transimpedance gain.  The BF862 JFET buffers the LTC6406 input, drastically reducing the effects of its bipolar input transistor current noise.  The VGS of the JFET is now included as an offset, but this is typically 0.6V so the __ Linear Technology/Analog Devices App Note, Mar 31, 2010

Single Supply 10MHz Lowpass Filter Features the LT1819 Op Amp & Adjustable Bandwidth Up to 20MHz -  Low noise, low distortion LT1819 circuit trades parts count and components sensitivity for an adjustable bandwidthup to 20MHz Diff in diff out circuit.  Measured signal-to-noise plus distortion for LT1819 circuit is 71.5dB, just a little nosier than the fixed bandwidth LT6600-10 filter differential filter. __ Linear Technology/Analog Devices App Note, Jul 2, 2012

Single Supply 16-Bit ADC Driver -  This circuit shows the LT6203 driving an LTC1864 unipolar 16-bit, 250ksps A/D converter.  The bottom half of the LT6203 is in a gain of 1 and buffers the 0V negative fullscale signal VLOW into the negative input of the LTC1864.  The upper half of the LT6203 is in a gain of 10, referenced to the buffered voltage VLOW and drives __ Linear Technology/Analog Devices App Note, Jul 2, 2012

Single-Ended to Differential Converter with Gain of +2 & Common Mode Control -  Because the gains of each channel of the LT6411 can be configured independently, the LT6411 can be used to provide a gain of +2 when amplifying differential signals and when converting single-ended signals to differential.  With both channels connected to a single-ended input, one channel configured with a gain of +1 and the __ Linear Technology/Analog Devices App Note, Mar 31, 2010

Single-sideband Demodulator covers the HF band -  10/26/00 EDN-Design Ideas The circuit in Figure 1 complements a previous Design Idea(SSB modulator covers HF band  EDN , Sept 30, 1999, pg 122].  The modulator employs a phasing. __ Circuit Design by Israel Schleicher, Bakersfield, CA

Small Area Photodiode in Normal TIA Configuration -  Small area photodiodes have low capacitance.  To maintain low noise operation it is important to keep the input capacitance low so that the miniscule input noise current of the CMOS amplifier, and not the voltage noise, dominates the overall circuit noise.  The total input capacitance from the amplifier in this circuit is the __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Solid state linear HF Amplifiers -  Not a project yet, but very theoretical thoughts about very practical amplifiers! __ Designed by Manfred Mornhinweg

Stepped Gain Photodiode Amplifier -  At low signal levels, the circuit has a high 100kΩ transimpedance gain, but at high signal levels the circuit automatically and smoothly changes to a low 3.1kΩ gain.  The beneit of a stepped gain approach is that it maximizes dynamic range. __ Linear Technology/Analog Devices App Note, Mar 22, 2010

S-Video Splitter (AC Coupled) -  This figure shows an LT6551 quad amplifier driving two sets of S-video (Y/C format) output cables from a single Y/C source.  Internal gain-setting resistors within the LT6551 reduce part-count. __ Linear Technology/Analog Devices App Note, Mar 25th 2010

Synthesized HF Receiver -  This receiver was originally designed for simplicity and low cost, but, like other projects, it grew.  My receiver is now synthesized and the performance is quite comparable to many commercial designs.  The unusual features of this design are: * Common AF transistors and AF circuitry have been used for the IF amp, in a transformerless design.  This aids construction and stability.  ; * IF bandwidth is restricted by conventional L.  C.  tuned circuits which are not damped by any resistive or active devices.  This gives a performance, even for CW working.  The IF is 500KHz and NOT 465KHz.  ; * Options for three different Local Oscillators.  I used a Marconi Sig.  Gen.  with this receiver for over a year, before I overcame lethargy and built a decent LO __ Designed by Harry Lythall-SM0VPO


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