JPH0327144U

JPH0327144U -

Info

Publication number: JPH0327144U
Application number: JP8831289U
Authority: JP
Priority date: 1989-07-27
Filing date: 1989-07-27
Publication date: 1991-03-19

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例による遅延ロツク
ドループを示す図、第２図と第３図は第１図にお
ける信号波形を示す図、第４図は従来の遅延ロツ
クドループを示す図、第５図は第４図における信
号波形を示す図である。図において、１は拡散信号復調器、２はバンド
パスフイルタ、３は検波器、４は第１のローパス
フイルタ、５は減算器、６は第２のローパスフイ
ルタ、７はクロツク発生器、８は拡散符号発生器
、９は局発信号変調器、１０は局発信号発生器、
１１は入力拡散信号、１２はサンプルホールド回
路、１３はスイツチ、１４はスイツチ切替信号発
生器、１５はサンプリング信号発生器である。な
お、図中、同一符号は同一または相当部分を示す
。 FIG. 1 is a diagram showing a delayed locked loop according to an embodiment of the invention, FIGS. 2 and 3 are diagrams showing signal waveforms in FIG. 1, FIG. 4 is a diagram showing a conventional delayed locked loop, and FIG. 5 is a diagram showing a conventional delayed locked loop. 4 is a diagram showing the signal waveform in FIG. 4. FIG. In the figure, 1 is a spread signal demodulator, 2 is a bandpass filter, 3 is a detector, 4 is a first low-pass filter, 5 is a subtracter, 6 is a second low-pass filter, 7 is a clock generator, and 8 is a a spreading code generator; 9 a local signal modulator; 10 a local signal generator;
11 is an input spread signal, 12 is a sample and hold circuit, 13 is a switch, 14 is a switch switching signal generator, and 15 is a sampling signal generator. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims

[Scope of utility model registration request]

a spread signal demodulator that demodulates a spread spectrum input signal with a local signal spread with the same spreading code as the input signal for spread demodulating the input signal; and a spread signal demodulator connected to the output end of the demodulator. a bandpass filter, a detector connected to the output end of the bandpass filter, a lowpass filter connected to the output end of the detector, and a pair of sample and hold circuits connected to the output end of the lowpass filter. , a subtracter whose input signal is each output of the pair of sample and hold circuits, a low-pass filter connected to the output terminal of the subtracter, a clock generator connected to the output terminal of the low-pass filter, and a clock generator connected to the output terminal of the low-pass filter; a spreading code generator connected to the output end of the generator; a switch that receives the two outputs of the spreading code generator as input; and a switch that uses the output signal of the switch as a modulation input signal and outputs the local oscillator signal generator. a local oscillator signal modulator that uses a signal as a carrier wave input signal and outputs an output signal as a local oscillator signal of the spreading demodulator; a sampling signal generator that supplies sampling dimensions to the sample hold circuit;
A delay locked loop comprising: a switch switching signal generator for controlling the switch from a sampling signal output from the sampling signal generator.