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buffer will provide impedance of 1/gm and in parallel with the load, RL. The gain of the buffer is gm(1/gm// RL).
In order to get gain =1, the output impedance of the buffer which is 1/gm must be 10 times smaller than RL. So, small smaller RL, you need even smaller 1/gm. Gm need to increase to...
hi
Buffer will isolate the output loading from your circuit. The loading can be resistive or capacitive loading.
Buffer provide high impedance at the input and low impedance at the output. The maximum gain of the buffer is 1.
if the buffer is going to connect to VNA or spectrum analyzer that has internal impedance of 50 ohm, should i match the output impedance of the buffer with 50 ohm to the spectrum analyzer with operating frequency of 3 MHz? Thanks
I have a question regarding the mixer. Currently, i design a mixer and going to tape out soon. My mixer is operated at 2.4 GHz and output frequency is 3 MHz and i need connect the mixer to a buffer for measurement purpose. Do i need a 50 ohm impedance matching for the output buffer? Because as...
Layout parasitic extraction (LPE) simulation
hi all
When I run layout parasitic extraction (LPE) simulation, is the substrate noise coupling is included or is model in the simulation?
dear all
i have 2 circuit or blocks cascoded together from a power suppy VDD. Block A operate at 1 GHz and block B operate at 1 MHZ. I appy the current reused technique. Both blocks are separated by an inductor to block the ac current but pass the DC current. My question is both blocks operate...
dear all
i have some questions about RF mixer.
1. We can find the conversion gain for mixer by using
a. voltage gain
b. power gain
c. S21 parameter ( forward gain versus frequency)
Actually what is the differrence from these three gain?
2. To find linearity of the mixer, normally we...
Re: Rout Op-Amp
put AC current source from output to ground or Iac=1,and run AC analysis.
and plot voltage across frequency. Your voltage is your output impedance.
R=V/I
and I=1, then R=V.
Re: Output stage for op-amp
if the load is resistive load, u must use source follower with the gain=1
if the load is capacitive load, u can use common source amplifier.
thank you for your information, normally what is the specification ADC need to look into for wireless application. For i know are as below:
1. Input frequency
2. Resolution ( number of bits)
3. Sampling rate.
4. Power dissipation.
what else i need to look into about the specification?
thank you
Re: How to deal with the layout of a circuit with large curr
hi
high current circuit , that mean more heat will be generated. don't place the circuit that sensitive to heat near to high current circuit like bandgap.
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