Amplifier Circuit

PROGRAMMABLE_GAIN_AMPLIFIER

Published:2009/6/18 22:13:00 Author:May

The gain of this amplifier is-Rf/R1 where Rf=effective value of resistance selected by the digital R1 inputs.IC1 op ampIC2 CD4066 quad bilateral switchR1 1-kΩ,1/4-W 5% resistorR2 10-kΩ,1/4-W 5% resistorR3 4.7-kΩ,1/4-W 5% resistorR4 2.2-kΩ,1/4-W 5% resistorR5 1-kΩ,1/4-W 5% resistorR6 2.2-kΩ,1/4-W 5% resistor   (View)

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HIGHPASS_AMPLIFIER

Published:2009/6/18 21:55:00 Author:May

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LOWPASS_AMPLIFIER

Published:2009/6/18 21:54:00 Author:May

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OPERATIONAL_TRANSCONDUCTANCE_AMPLIFIER_WITH_BOOSTER

Published:2009/6/18 21:50:00 Author:May

Implementing a bidirectional precision current amplifier in an operational transconductance am-plifier (OTA) can boost the OTA's output current. To accomplish this task, two diodes and a comple-mentary stage are added to this otherwise simple design.   (View)

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PRECISION_HIGH_GAIN_DIFFERENTIAL_AMP

Published:2009/6/18 4:10:00 Author:May

This circuit has a galn of 60 dB and a gatn bandwidth of 8 MHz.   (View)

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BASIC_OP_AMP_DIFFERENTIAL_AMPLIFIER

Published:2009/6/18 4:07:00 Author:May

In most cases, R1 is equal to R2 and R3, has the same value as R4 These equalities don't always have to be true, but they do significantly simplify the circuit design in most practical applications. In any case, for a true differential amplifier, the R3,:R1and R2;R4 ratios must be equal. That is:The circuit still functions even if these ratios are not maintained, but the signals at the inverting and noninverting inputs are subjected to differing amounts of gain, which would be undesirable in most practical applications.These resistance ratioi determine the gain of the amplifier:Assuming that the resistance ratios are maintained, the output voltage is equal to the differences between the two input voltages, multiplied by the gain. That is,   (View)

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RF_PREAMPLIFIERS

Published:2009/6/18 2:27:00 Author:May

In this basic MAR-x-based circuit, both the input and output are comprised of a single dc-blocking capacitor (C1 and C2 for the input and output, respectively). The dc power-supply net-work (comprised of L1 and BI) is attached to the MAR-x via the RF-output terminal (lead 3).   (View)

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LC_TUNED_AMPLIFIERS

Published:2009/6/18 2:17:00 Author:May

This basic tuned LC amplifier can be used with three output coupling methods. They are capac-itive coupling output, capacitive tapped output, or Iink-coupled output.   (View)

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5_W_7_MHz_RF_POWER_AMPLIFIER

Published:2009/6/18 2:16:00 Author:May

The circuit shown will produce up to 5-W RE output in the 40-m (7 MHz) amateur band. The coils shown are wound on toroidal cores (Armdon Associates Inc.). The part numbers are given in the schematic. The circuit requires about 20-mW drive and a 13-V supply.   (View)

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455_kHz_IF_AMP_FOR_15_V_OPERATION

Published:2009/6/18 2:11:00 Author:May

The ZN416E can be configured as a simple 455-kHz IF amplifier. In this case, the circuit's center and bandwidth are set by RES1 (a Murata CSB455E ceramic resonator).   (View)

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SWITCHABLE_HF_VHF_ACTIVE_ANTENNA

Published:2009/6/18 2:10:00 Author:May

The AA-7 active antenna contains only two active elements: Q1 (an MFE201 N-channel dual-gate FET) and Q2 (a 2SC2570 npn VHF silicon transistor), which provide the basis of two indepen-dent, switchable RE preamplifiers.   (View)

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12_kW_144_MHz_LINEAR_AMPLIFIER

Published:2009/6/18 2:09:00 Author:May

Schematic diagram ofthe 2-meter amplifier   (View)

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455_kHz_IF_AMPLIFIER

Published:2009/6/18 2:01:00 Author:May

Up to bU dB of gam at 455 kHz is available with the MC1350P. RES1 is a ceramic resonator, LC, or crustal filter. Keep the leads to pins,1, 2, 3, and 7 short.   (View)

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144__TO_2304_MHz_UHF_BROADBAND_AMPLIFIER

Published:2009/6/18 1:57:00 Author:May

Based on an MAR－6 preamp, this circuit yields low noise figures and useful gain for the 144-MHz to 2304-MHz amateur bands.   (View)

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UHF_AMPLIFIER

Published:2009/6/18 1:55:00 Author:May

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SIMPLE_455_kHz_IF_AMPLIFIER

Published:2009/6/18 1:54:00 Author:May

The ZN416E can be configured as a simple 455-kHz IF amplifier. In this case, the drcuit's center frequency and bandwidth are set by RES1 (a Murata CSB455E ceramic resonator).   (View)

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20_W_1296_MHz_AMPLIFIER_MODULE

Published:2009/6/18 1:53:00 Author:May

Using a Mitsubishi M57762 amplifier module, this amplifier delivers 20-W output on 1296 MHz. A single 12-V nominal power supply can be used.   (View)

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2_METER_FET_POWER_AMPLIFIER_FOR_HTs

Published:2009/6/18 1:48:00 Author:May

Using a power MOSFET, this amplifier can boast a 2-W handie-talkie power level to around 10 W on 2 meters. A transmission-line RE switch is used for T/R switching.   (View)

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10_W_10_METER_LINEAR_AMPLIFIER

Published:2009/6/18 1:45:00 Author:May

This linear amplifier delivers 10-W PEP output with 1.25-W drive on 10 m. T1, T2, and T3 are 10 turns of bifilar windings on an FT-50-43 toroidal core. The transformers are broadband. Filters for other bands, if desired, are shown.   (View)

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WIDEBAND_POWER_AMPLIFIER

Published:2009/6/18 1:43:00 Author:May

Using TRW P/N CA-815H, a 17-dB gain am-plifier that delivers 100 mW over 10 to 1000 MHz can be constructed. The CA-2870 will yield 0.4 W with 34-dB gain from 20 to 400 MHz.   (View)

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