TH9876EX - Regulated frequency generator - Google Patents

Abstract

A crystal-controlled frequency generator of TV tuner decoder using CMOS composite technology. With the first, 50 second, 51 a and third 51b differential amplifiers, it will produce a first, second and third anti-dual phase output signal. A second differential expander and The third will have a variable receiver that will change the brush in In contrast to the 123 a frequency control signal, the 124 a crystal frequency signal is connected to the corresponding input terminal. Of the differential amplifier Therefore, the phase of the signal being Developed at the input terminal of the differential amplifier will be Approximately 90 degrees shift of the phase relative to the signal that Developed at the input terminals of two other amplifiers, three pairs of output signals 1501, 1502, 1515, 1516, 1528, 1529 are collected into a single-ended frequency signal which is then connected. Reverse with the crystals to get the complete control feedback path. Which the frequency of the change will be determined according to Frequency control contract

Claims (1)

1. A controllable phase-shifting circuit for controlling the phase of the reference signal consists of 124 b, C1 devices for providing the first and second signals. Such first and second signals have a phase difference between them. First differential 50 responds to The first such signal is to produce the first 1501 output signal and the second 1502 anti-phase. The second differential amplifier 51 responds to The aforementioned second signal provides a controlled quantity of the third 1516 and the fourth 1515 anti-phase signals in response.