GB1283687A - Improvements in or relating to frequency-controlled oscillator circuits - Google Patents

Improvements in or relating to frequency-controlled oscillator circuits

Info

Publication number
GB1283687A
GB1283687A GB7702/70A GB770270A GB1283687A GB 1283687 A GB1283687 A GB 1283687A GB 7702/70 A GB7702/70 A GB 7702/70A GB 770270 A GB770270 A GB 770270A GB 1283687 A GB1283687 A GB 1283687A
Authority
GB
United Kingdom
Prior art keywords
signal
oscillator
gain
frequency
bias
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB7702/70A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19691908267 external-priority patent/DE1908267C/en
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1283687A publication Critical patent/GB1283687A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/10—Angle modulation by means of variable impedance
    • H03C3/12—Angle modulation by means of variable impedance by means of a variable reactive element
    • H03C3/22—Angle modulation by means of variable impedance by means of a variable reactive element the element being a semiconductor diode, e.g. varicap diode
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/107—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

1283687 Automatic frequency control; transistor amplifiers SIEMENS AG 18 Feb 1970 [19 Feb 1969] 7702/70 Headings H3A and H3T In a retroactive A.F.C. system wherein an oscillator has its frequency controlled by a variable capacity diode, and wherein coarse frequency control is effected by applying a bias voltage to the diode, variations in loop gain arising from varying the bias are obviated by also applying the bias to a gain control circuit in the loop. As described, Fig. 3, the gain control circuit comprises an amplifier T 1 ... T 4 with a negative feedback loop GK which includes an FET, T 5 acting as a variable impedance in a potential divider. The impedance, and thus the amplifier gain, is adjusted by the control signal which adjusts the bias on the oscillator tuning variable capacity diode Var. Initial lock-in of the circuit is provided by sweep generator T 6 , T 7 . The control arrangement may be employed in a frequency modulated transmitter, Fig. 2, in which the output from oscillator O s is mixed at M with a signal from a refrence oscillator R o to produce an I.F. signal. This I.F. signal and the required information signal Zf2 modulated on to a similar carrier are applied to a phase comparator to produce an error signal U R which is amplified by the gain controlled amplifier GV to produce the frequency control signal for the oscillator O s .
GB7702/70A 1969-02-19 1970-02-18 Improvements in or relating to frequency-controlled oscillator circuits Expired GB1283687A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691908267 DE1908267C (en) 1969-02-19 Vibration generator provided with a frequency readjustment circuit

Publications (1)

Publication Number Publication Date
GB1283687A true GB1283687A (en) 1972-08-02

Family

ID=5725708

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7702/70A Expired GB1283687A (en) 1969-02-19 1970-02-18 Improvements in or relating to frequency-controlled oscillator circuits

Country Status (10)

Country Link
JP (1) JPS5330979B1 (en)
AT (1) AT336678B (en)
BE (1) BE746215A (en)
BR (1) BR7016840D0 (en)
CH (1) CH504135A (en)
FR (1) FR2031529B1 (en)
GB (1) GB1283687A (en)
LU (1) LU60366A1 (en)
NL (1) NL155689B (en)
YU (1) YU33422B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2155711A (en) * 1984-03-13 1985-09-25 Alcatel Thomson Faisceaux Ultrahigh frequency active filter
GB2225187A (en) * 1988-11-18 1990-05-23 Mitel Corp Agc circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5683135A (en) * 1979-12-10 1981-07-07 Sony Corp Pll circuit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1401907A (en) * 1963-07-24 1965-06-04 Plessey Uk Ltd Transistor amplifier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2155711A (en) * 1984-03-13 1985-09-25 Alcatel Thomson Faisceaux Ultrahigh frequency active filter
GB2225187A (en) * 1988-11-18 1990-05-23 Mitel Corp Agc circuit
GB2225187B (en) * 1988-11-18 1993-07-07 Mitel Corp Agc circuit

Also Published As

Publication number Publication date
YU40170A (en) 1976-06-30
NL7001746A (en) 1970-08-21
ATA143070A (en) 1976-09-15
LU60366A1 (en) 1970-04-17
JPS5330979B1 (en) 1978-08-30
BR7016840D0 (en) 1973-06-14
DE1908267A1 (en) 1970-09-10
NL155689B (en) 1978-01-16
CH504135A (en) 1971-02-28
AT336678B (en) 1977-05-25
FR2031529A1 (en) 1970-11-20
DE1908267B2 (en) 1973-01-25
FR2031529B1 (en) 1973-07-13
YU33422B (en) 1976-12-31
BE746215A (en) 1970-08-19

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee