Using these SPICE parameters, implement the following circuit in SPICE:
Simulate the both the single-ended differential gain and the single ended common mode gain in PSPICE. What is the midband gain, low frequency rolloff, and high frequency rolloff? What is the CMRR?
Construct this amplifier and ground the base terminals. Try to find two resistors that have close to the same value. Check the DC bias by looking at the collector voltage and drop across the bias resistance. How much mismatch voltage do you have? How do the currents compare to SPICE?
Check the common mode amplification by applying a small signal to both terminals. Vary the frequency of this signal from 100hz to 100khz and record the voltage gain as a function of frequency. Do you see variation in the common mode gain?
Check the single ended differential gain by grounding one terminal and applying a small signal to the other. How does the single-ended gain vary in the frequency? How does it compare to SPICE? Is the 3db prediction accurate? What is the measured CMRR?
Construct a bipolar current mirror to replace the resistor bias. Try to match the current level as close as possible.
