21. As compared with the common-base connection, it has higher input impedance and lower output impedance . 22. An " ideal " current source has an infinite output impedance in parallel with the source. 23. ;Symmetrical networks : A network is symmetrical if its input impedance is equal to its output impedance . 24. One simply needs to know the input impedance R p and to choose the output impedance R s. 25. If output impedance is large compared to the impedance of the headphones, significantly higher distortion will be present. 26. A feedback voltage amplifier using an op amp with finite gain but infinite input impedances and zero output impedance . 27. A " real-world " current source has a very high, but finite output impedance . 28. The Circlotron is fully symmetrical and does not require large amounts of feedback to reduce output impedance and distortion. 29. This circuitry increases the amplifier's output impedance , resulting in response similar to that of tube amplifiers. 30. The improvement factors ( 1 + ? FB A OL ) for determining input and output impedance might not work.
