JPH01115342U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の局部発振回路を使用した受信
器の構成図である。 １……受信空中線、２……高周波増幅回路、３
……第１混合回路、４……電圧制御発振器（ＶＣ
Ｏ）、５……可変分周器、６，１４……位相比較
回路、７，１６……ローパスフイルタ、８，１２
……帯域フイルタ、９……第２混合回路、１０…
…第２局部発振器、１１，１５……分周器、１３
……第２中間周波増幅回路。 FIG. 1 is a block diagram of a receiver using the local oscillation circuit of the present invention. 1... Receiving antenna, 2... High frequency amplification circuit, 3
...First mixing circuit, 4...Voltage controlled oscillator (VC
O), 5... Variable frequency divider, 6, 14... Phase comparison circuit, 7, 16... Low pass filter, 8, 12
...Band filter, 9...Second mixing circuit, 10...
...Second local oscillator, 11, 15... Frequency divider, 13
...Second intermediate frequency amplification circuit.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 高安定周波数の電波を放射する無線機との交信
を行う無線機のＰＬＬ形ダブルスーパーヘテロダ
イン方式の受信部において、第２局部発振器１０
に中間増幅回路の通過帯域内に入る程度の周波数
安定度を有する基準発振器を用い、該発振器１０
の出力を分周して第１局部発振器の位相比較器６
に基準信号として加えると共に、更に他の分周器
１５を経て位相比較回路１４の一端に加え、又他
端に第２中間周波信号を入力し、両者の差出力を
ローパスフイルタ１６を通して前記第２局部発振
器１０の周波数の微調を行うように構成したこと
を特徴とする高安定局部発振回路。 A second local oscillator 10 is used in a PLL type double superheterodyne receiving section of a radio device that communicates with a radio device that emits radio waves of a highly stable frequency.
A reference oscillator having a frequency stability that falls within the passband of the intermediate amplifier circuit is used for the oscillator 10.
The phase comparator 6 of the first local oscillator divides the output of the first local oscillator.
is added as a reference signal, and is also added to one end of the phase comparison circuit 14 via another frequency divider 15, and a second intermediate frequency signal is inputted to the other end, and the difference output between the two is passed through a low-pass filter 16 to the second A highly stable local oscillation circuit characterized in that it is configured to finely adjust the frequency of a local oscillator 10.