JPH0282133U

JPH0282133U -

Info

Publication number: JPH0282133U
Application number: JP16142288U
Authority: JP
Priority date: 1988-12-13
Filing date: 1988-12-13
Publication date: 1990-06-25

Description

[Brief explanation of drawings]

第１図は本考案の位相同期判別回路を含む自動
位相制御装置の一実施例の回路図、第２図ａ及び
ｂは夫々位相同期非確立時と位相同期確立時の出
力信号状態を示す波形図、第３図は従来の位相同
期判別回路を含む自動位相制御装置の回路図であ
る。１……混合器、２……利得制御増幅器、３……
第１の位相検波器、４……基準信号発生器、５…
…位相同期ループろ波器、６……電圧制御発振器
、７……第２の位相検波器、８……９０°位相器
、９……ＡＧＣループろ波器、１０……低域ろ波
器、１１……位相同期判別器、１２……第１の基
準電圧発生器、１３……入力端子、１４……第２
の基準電圧発生器、ＳＷ……スイツチ、Ｐｉ……
入力信号、Ｓ_１……位相同期表示信号。 FIG. 1 is a circuit diagram of an embodiment of an automatic phase control device including a phase synchronization determination circuit of the present invention, and FIGS. 2 a and b are waveforms showing output signal states when phase synchronization is not established and when phase synchronization is established, respectively. 3 are circuit diagrams of an automatic phase control device including a conventional phase synchronization determination circuit. 1... Mixer, 2... Gain control amplifier, 3...
First phase detector, 4...Reference signal generator, 5...
...Phase locked loop filter, 6...Voltage controlled oscillator, 7...Second phase detector, 8...90° phase shifter, 9...AGC loop filter, 10...Low pass filter , 11... Phase synchronization discriminator, 12... First reference voltage generator, 13... Input terminal, 14... Second
Reference voltage generator, SW... switch, Pi...
Input signal, _S1 ...Phase synchronization display signal.

Claims

[Scope of utility model registration request]

A reference signal generator that generates a reference signal, a 90° phase shifter that shifts the phase of this reference signal by 90°, a voltage controlled oscillator, a mixer that mixes the input signal and the output of the voltage controlled oscillator, and a mixer. a first phase detector that detects the phase of the output and the reference signal and outputs the detected output to the voltage controlled oscillator;
A second phase detector that detects the phase of the output of the 0° phase detector, a low-pass filter that low-pass filters the detected output of the second phase detector, and a reference to the output of the low-pass filter. In an automatic phase control device comprising a phase synchronization discriminator that determines whether phase synchronization is established by comparing the voltage with a voltage and outputs a phase synchronization display signal, generating different reference voltages for each of the phase synchronization discriminators. First thing to do
and a second reference voltage generator, and the phase synchronization discriminator is configured to switch the reference voltage generator according to a phase synchronization display signal output from the phase synchronization discriminator.