All Questions
Tagged with impedance-matching amplifier
45
questions
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44
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Impedance matching T/R switch
I do drive a piezo as transceiver. My transmitter provides square burst around 10Vpp which is too big for simply switching through a diode by dc biasing. I found out that bridge rectifier structure ...
- 39
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votes
2
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98
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Why should we choose a non-inverting op-amp in this context?
I need to build the cheapest amplifier possible knowing Rin, Rch, Vin <= 1 mV, Vout = 12 V and the simplified datasheet of four differents op-amps:
Here is my book's answer:
It is claimed that:
...
user328798
1
vote
1
answer
78
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How can I match the impedances in this circuit?
I have a pre-amplifier with 93.1 Ω output impedance connected to a main amplifier with input impedance of 1000 Ω via 75 Ω co-axial cable.
The signals are very small pulses from a measurement device ...
- 15
2
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115
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Function generator impedance matching with an amplifier
I am currently designing an experiment with a material which at low temperatures (below 180K) works like a light detector for infrared. There needs to be a bias applied to the sample which has to be ...
- 21
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answer
598
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How to calculate the output resistance of the CE amplifier, which has only a coil in its collector?
In order to be able to match the impedance, it is necessary to know the output resistance of the amplifier.
In radio frequency amplifier circuits, there is usually a coil in the collector instead of a ...
- 105
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281
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Placing the BPF and impedance matching on the output and on the input
I am working on solving a problem, namely I need to add input and output matching to my circuit and I am not sure where I should put them. Additionally, in the circuit I want to use a bandpass filter ...
- 41
2
votes
1
answer
131
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Does an LNA with a dedicated Vbias pin affect impedance matching?
I am optimizing an impedance match for an LNA in my target frequency range using a Touchstone s2p that Qorvo provides for the QPL9547 (datasheet).
The Vbias pin is separate from the RF-in pin. I'm ...
- 2,190
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91
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Input and output impedance matching for the HMC414 amplifier
I have a question about the impedance matching at the input and output of the HMC414 power amplifier. I don't know exactly where to put this matching, and I wouldn't want to make a mistake. The ...
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68
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Is there a typical "Active Directivity" for LDMOS components?
Active Directivity is a measure of how much an amplifier's source match potentially affects its output impedance, or its load match affects its input impedance. High active directivity is a good thing....
- 2,190
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76
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How should I model the DC power supply that powers the drain of an LDMOS RF power amplifier?
We would like to model a switching power supply for an LDMOS RF power amp so we can design the bias tee powering the drain to reflect as much RF as possible to keep RF out of the power supply. The ...
- 2,190
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35
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Power gain values at the microwave amplifier
I have generated graphs in AWR software for signal gains, G_A, G_max, G_P and G_T, respectively. The amplifier I am using is "HMC141". Unfortunately, the values that came out look like this:
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1
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79
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Schematic of an amplifier with bandpass filter and impedance matching
I am having trouble creating a block diagram in PADS Professional Designer. My HMC414 amplifier has IN input, two OUT outputs, and additionally VCC, VPD1, VPD2 and GND pins (there is also NC [Not ...
- 41
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1
answer
233
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Impedance matching of an amplifier circuit with a filter at the input and output
I created an amplifier circuit with a filter on the output.
I did impedance matching on the input and then did matching on the output as well. From the graphs below, is the circuit more matched?
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119
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Impedance matching - amplifier and surface acoustic wave (SAW) filter
How would I properly do impedance matching for the amplifier and saw filter at the output of the circuit?
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1
answer
586
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Resistor circuit to correct impedance matching and attenuate signal by 10 decibels
I've got a Line Out on my amplifier with 100-600 ohm impedance (avg. 350). I have it connected to an effects pedal that has a 1M ohm input.
Right now the signal is clipping from the amplifier and I ...
- 105