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we are looking for one to two senior RFIC designer, company located in Changsha, China.
The requirements are:
1. BSEE or MSEE with at least 3 years' industry experience;
2. Hands on design experience with LNA, mixer, VGA, PA-driver, PLL, VCO, etc.
3. Familiar with RFIC layout;
nyquist sampling bandwidth adc
!! I thought sampling time should be twice of the carrier frequency, for the Nyquist theory.
Is it the twice of the bandwidth the lowest frequency for subsampling?
if sampling at 93.3 mhz aliasing
Could alias sampling truthfully track original signals?
I don't believe so.
But in datasheet for GP2015 and its series products, they use 5.714MHz to sample 4.309MHz signal and expect an almost idea output with 30% set high of the time.
As I simulate, with...
how many percent could rise and fall time exist in an sampling circuit?
Here it is used in the 2 bit AD in GPS circuit.
I think that depends on the sampling clock, signal clock and the baseband demodulation requirement.
Any formula to caculate this?
i try that circuit in the book too.
I use a large sinewave to do it.
The transient output rise and fall at different input voltage, I think this shows the hysteresis performance.
But I don't see oscillation.
you could use .measure to measure the noise voltage at needed frequency and .print+a formular for NF calculation. The formular depends on your netlist. The problem is how to make sure the formular is right.
noise in bandgap
THanks for your answer.
However though wideband reference is good for power supply rejection, here there is another probelm if the bandgap is for an amplifier. Cause if no enough filtering is offered, the circuit is tend to oscillate. Shouldn't the power supply ripples...