| 摘要 |
A phase modulator circuit includes a pair of similar long-tailed pair transistor amplifiers (TR11, TR12 and TR13, TR14) to which sinusoidal signals are fed. The transistor pairs form the collection loads of a further long tailed pair (TR21, TR22) fed with a modulator signal. The circuit generates an output of constant amplitude but modulated in phase in correspondence with the modulated signal. The circuit may be used in the supervisory unit of a telecommunication repeater.
|
