GB1357187A - Heterodyne circuits - Google Patents
Heterodyne circuitsInfo
- Publication number
- GB1357187A GB1357187A GB3888971A GB3888971A GB1357187A GB 1357187 A GB1357187 A GB 1357187A GB 3888971 A GB3888971 A GB 3888971A GB 3888971 A GB3888971 A GB 3888971A GB 1357187 A GB1357187 A GB 1357187A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oscillator
- output
- feeds
- capacitor
- filter
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
1357187 Frequency changing; automatic frequency control SIEMENS AG 19 Aug 1971 [20 Aug 1970] 38889/71 Headings H3A and H3T In a heterodyne circuit for v.h.f. a mixer stage M, Fig. 1, is supplied with a harmonic of an oscillation supplied by an oscillator G which is overdriven to such an extent that the required harmonic is produced with significantly more energy than is required in the mixing stage, the oscillator output being fed to the mixer stage M via a filter circuit BP which filters out the desired harmonic and passes this to an attenuating element DR 1 for setting the required energy level; the oscillator G is provided with an automatic frequency control circuit AFC operating at the fundamental frequency. In the embodiment the output of the oscillator G is fed to a stage W comprising a high-pass HP and a lowpass TP filter in parallel, the output of the first of which feeds the bandpass filter BP and the output of the second feeds the AFC circuit via an attenuator DR2, The output of the attenuator DR1 feeds the mixer M via a circulator RG, to the second input of which is applied the signal frequency via a band-pass filter BPE. A construction comprises a screening box divided into three compartments I, II, III, Fig. 2 by separators. The first compartment I contains the oscillator tuning element, comprising a line K i tuned by adjustable capacitor C D , and having coupled to its lower end varactor diode D K1 to which the AFC voltage is applied. There is also coupled in a second varactor diode D K2 which serves for modulating the oscillator. The second compartment II contains oscillator transistor T which operates in the common collector mode, its base being coupled to the line K i via a capacitor C 1 <SP>1</SP>. The output from the emitter of transistor T is fed via capacitor C 2 <SP>1</SP> into the third compartment III and thence into a highpass filter comprising capacitor C3 and inductor L3: this feeds the third harmonic of the oscillator frequency into a bandpass filter comprising inductors L 4 , L 5 and capacitors C 4 , C 5 , C 6 . A low-pass filter comprising inductor L 6 and capacitor C 7 selects the fundamental oscillator frequency and feeds this, via an attenuator comprising resistors R , R 2 , R 3 to the AFC circuit.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19702041470 DE2041470C3 (en) | 1970-08-20 | 1970-08-20 | Superimposition device for very short electromagnetic waves |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1357187A true GB1357187A (en) | 1974-06-19 |
Family
ID=5780310
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3888971A Expired GB1357187A (en) | 1970-08-20 | 1971-08-19 | Heterodyne circuits |
Country Status (11)
Country | Link |
---|---|
JP (1) | JPS526564B1 (en) |
AT (1) | AT308825B (en) |
AU (1) | AU466208B2 (en) |
BE (1) | BE771603A (en) |
DE (1) | DE2041470C3 (en) |
FR (1) | FR2103395B1 (en) |
GB (1) | GB1357187A (en) |
IT (1) | IT940441B (en) |
NL (1) | NL150974B (en) |
SE (1) | SE376341B (en) |
YU (1) | YU34951B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1542355A1 (en) * | 2003-12-08 | 2005-06-15 | Alps Electric Co., Ltd. | Voltage controlled oscillator for frequency synthesizer |
WO2006008672A1 (en) * | 2004-07-13 | 2006-01-26 | Koninklijke Philips Electronics N.V. | Modulator comprising a dual-frequency oscillator and a synthesizer |
-
1970
- 1970-08-20 DE DE19702041470 patent/DE2041470C3/en not_active Expired
-
1971
- 1971-08-18 FR FR7130061A patent/FR2103395B1/fr not_active Expired
- 1971-08-18 AT AT720671A patent/AT308825B/en not_active IP Right Cessation
- 1971-08-19 YU YU213171A patent/YU34951B/en unknown
- 1971-08-19 JP JP6331471A patent/JPS526564B1/ja active Pending
- 1971-08-19 IT IT2763271A patent/IT940441B/en active
- 1971-08-19 SE SE1055471A patent/SE376341B/xx unknown
- 1971-08-19 GB GB3888971A patent/GB1357187A/en not_active Expired
- 1971-08-20 BE BE771603A patent/BE771603A/en unknown
- 1971-08-20 NL NL7111540A patent/NL150974B/en unknown
- 1971-08-20 AU AU32594/71A patent/AU466208B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1542355A1 (en) * | 2003-12-08 | 2005-06-15 | Alps Electric Co., Ltd. | Voltage controlled oscillator for frequency synthesizer |
US7292108B2 (en) | 2003-12-08 | 2007-11-06 | Alps Electric Co., Ltd. | Voltage controlled oscillator for frequency synthesizer |
WO2006008672A1 (en) * | 2004-07-13 | 2006-01-26 | Koninklijke Philips Electronics N.V. | Modulator comprising a dual-frequency oscillator and a synthesizer |
Also Published As
Publication number | Publication date |
---|---|
FR2103395A1 (en) | 1972-04-14 |
FR2103395B1 (en) | 1976-05-28 |
NL150974B (en) | 1976-09-15 |
JPS526564B1 (en) | 1977-02-23 |
IT940441B (en) | 1973-02-10 |
BE771603A (en) | 1971-12-31 |
SE376341B (en) | 1975-05-12 |
NL7111540A (en) | 1972-02-22 |
DE2041470C3 (en) | 1974-12-19 |
YU213171A (en) | 1979-10-31 |
DE2041470B2 (en) | 1974-05-16 |
DE2041470A1 (en) | 1972-03-30 |
AU466208B2 (en) | 1975-10-23 |
AT308825B (en) | 1973-07-25 |
YU34951B (en) | 1980-04-30 |
AU3259471A (en) | 1973-02-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |