JPS5634202A - Fm demodulating circuit - Google Patents
Fm demodulating circuitInfo
- Publication number
- JPS5634202A JPS5634202A JP11057079A JP11057079A JPS5634202A JP S5634202 A JPS5634202 A JP S5634202A JP 11057079 A JP11057079 A JP 11057079A JP 11057079 A JP11057079 A JP 11057079A JP S5634202 A JPS5634202 A JP S5634202A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- terminal
- output
- supplied
- circuit
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
-
- 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
- H03B2200/00—Indexing scheme relating to details of oscillators covered by H03B
- H03B2200/006—Functional aspects of oscillators
- H03B2200/0082—Lowering the supply voltage and saving power
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D13/00—Circuits for comparing the phase or frequency of two mutually-independent oscillations
- H03D13/003—Circuits for comparing the phase or frequency of two mutually-independent oscillations in which both oscillations are converted by logic means into pulses which are applied to filtering or integrating means
- H03D13/004—Circuits for comparing the phase or frequency of two mutually-independent oscillations in which both oscillations are converted by logic means into pulses which are applied to filtering or integrating means the logic means delivering pulses at more than one terminal, e.g. up and down pulses
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
- H03D2200/0001—Circuit elements of demodulators
- H03D2200/0009—Emitter or source coupled transistor pairs or long tail pairs
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
- H03D2200/0041—Functional aspects of demodulators
- H03D2200/0082—Quadrature arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuits Of Receivers In General (AREA)
- Superheterodyne Receivers (AREA)
Abstract
PURPOSE:To obtain an FM detector which demonstrates its superior performance even for the FM receiver using a low-voltage power source of 3V or less, by constituting a demodulating circuit by an intermediate frequency signal amplifier, a phase shift circuit, an amplitude limiting amplifier, an OR circuit, an LPF, a low- frequency amplifier, and so on. CONSTITUTION:The FM intermediate frequency signal input from terminal T is applied to intermediate frequency signal amplifier 21, and the output is supplied to phase shift circuit 22 through terminal (u), and simultaneously, the output to terminal (u) is branched and is supplied to amplitude limiting amplifier 23 also. Next, the output of circuit 22 is applied to another amplitude limiting amplifier 24 through terminal (v), and two outputs which are generated in amplifier 23 and are inverted for each other are supplied to OR circuits 25 and 26 through M and N point respectively, and one output from amplifier 24 is applied to circuits 25 and 26 also. After that, outputs of circuits 25 and 26 are supplied to LPFs 27 and 28 through P and Q points respectively, and their outputs are applied to low-frequency amplifier 29 through R and S points respectively, and are taken out as the FM demodulation output from terminal (o).
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11057079A JPS5634202A (en) | 1979-08-29 | 1979-08-29 | Fm demodulating circuit |
US06/181,930 US4339726A (en) | 1979-08-29 | 1980-08-27 | Demodulator of angle modulated signal operable by low power voltage |
GB8027794A GB2060291B (en) | 1979-08-29 | 1980-08-28 | Angle demodulators |
DE3050934A DE3050934C2 (en) | 1979-08-29 | 1980-08-29 | Demodulator circuit for demodulating an angle-modulated input signal |
DE3032660A DE3032660C2 (en) | 1979-08-29 | 1980-08-29 | Demodulator circuit for demodulating an angle-modulated input signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11057079A JPS5634202A (en) | 1979-08-29 | 1979-08-29 | Fm demodulating circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5634202A true JPS5634202A (en) | 1981-04-06 |
JPS643083B2 JPS643083B2 (en) | 1989-01-19 |
Family
ID=14539173
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11057079A Granted JPS5634202A (en) | 1979-08-29 | 1979-08-29 | Fm demodulating circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5634202A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01249894A (en) * | 1988-02-17 | 1989-10-05 | Shell Internatl Res Maatschappij Bv | Lubricant composition containing viscosity index modifier having dispersant characteristics |
EP0467358A2 (en) * | 1990-07-18 | 1992-01-22 | Fujitsu Limited | A demodulator and a polarization diversity receiver for coherent optical communication provided with the demodulator |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53125751A (en) * | 1977-04-08 | 1978-11-02 | Toshiba Corp | Fm detection circuit |
-
1979
- 1979-08-29 JP JP11057079A patent/JPS5634202A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53125751A (en) * | 1977-04-08 | 1978-11-02 | Toshiba Corp | Fm detection circuit |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01249894A (en) * | 1988-02-17 | 1989-10-05 | Shell Internatl Res Maatschappij Bv | Lubricant composition containing viscosity index modifier having dispersant characteristics |
EP0467358A2 (en) * | 1990-07-18 | 1992-01-22 | Fujitsu Limited | A demodulator and a polarization diversity receiver for coherent optical communication provided with the demodulator |
US5253097A (en) * | 1990-07-18 | 1993-10-12 | Fujitsu Limited | Demodulator and a polarization diversity receiver for coherent optical communication provided with the demodulator |
Also Published As
Publication number | Publication date |
---|---|
JPS643083B2 (en) | 1989-01-19 |
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