[go: up one dir, main page]

GB2234643B - Frequency modulator - Google Patents

Frequency modulator

Info

Publication number
GB2234643B
GB2234643B GB8917675A GB8917675A GB2234643B GB 2234643 B GB2234643 B GB 2234643B GB 8917675 A GB8917675 A GB 8917675A GB 8917675 A GB8917675 A GB 8917675A GB 2234643 B GB2234643 B GB 2234643B
Authority
GB
United Kingdom
Prior art keywords
frequency modulator
modulator
frequency
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 - Fee Related
Application number
GB8917675A
Other versions
GB8917675D0 (en
GB2234643A (en
Inventor
Ian Garth Watson
Nicholas Paul Cowley
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.)
Plessey Semiconductors Ltd
GE Healthcare UK Ltd
Plessey Co Ltd
Original Assignee
Plessey Semiconductors Ltd
GE Healthcare UK Ltd
Plessey Co Ltd
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
Application filed by Plessey Semiconductors Ltd, GE Healthcare UK Ltd, Plessey Co Ltd filed Critical Plessey Semiconductors Ltd
Priority to GB8917675A priority Critical patent/GB2234643B/en
Publication of GB8917675D0 publication Critical patent/GB8917675D0/en
Publication of GB2234643A publication Critical patent/GB2234643A/en
Application granted granted Critical
Publication of GB2234643B publication Critical patent/GB2234643B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H03C3/14—Angle modulation by means of variable impedance by means of a variable reactive element simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit
    • H03C3/145—Angle modulation by means of variable impedance by means of a variable reactive element simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit by using semiconductor elements
    • 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
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1206—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification
    • H03B5/1209—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification the amplifier having two current paths operating in a differential manner and a current source or degeneration circuit in common to both paths, e.g. a long-tailed pair.
    • 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
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1231—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more bipolar transistors
    • 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
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
    • H03B5/124—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance
    • H03B5/1246—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance the means comprising transistors used to provide a variable capacitance
    • H03B5/125—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance the means comprising transistors used to provide a variable capacitance the transistors being bipolar transistors
    • 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
    • H03B2200/003—Circuit elements of oscillators
    • H03B2200/0036—Circuit elements of oscillators including an emitter or source coupled transistor pair or a long tail pair
GB8917675A 1989-08-02 1989-08-02 Frequency modulator Expired - Fee Related GB2234643B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8917675A GB2234643B (en) 1989-08-02 1989-08-02 Frequency modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8917675A GB2234643B (en) 1989-08-02 1989-08-02 Frequency modulator

Publications (3)

Publication Number Publication Date
GB8917675D0 GB8917675D0 (en) 1989-09-20
GB2234643A GB2234643A (en) 1991-02-06
GB2234643B true GB2234643B (en) 1993-07-14

Family

ID=10661057

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8917675A Expired - Fee Related GB2234643B (en) 1989-08-02 1989-08-02 Frequency modulator

Country Status (1)

Country Link
GB (1) GB2234643B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2033182A (en) * 1978-09-26 1980-05-14 Sony Corp Variable frequency filters
EP0033473A2 (en) * 1980-01-30 1981-08-12 Siemens Aktiengesellschaft Current controlled oscillator
EP0140429A1 (en) * 1983-10-07 1985-05-08 Philips Electronics Uk Limited Voltage controlled oscillator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2033182A (en) * 1978-09-26 1980-05-14 Sony Corp Variable frequency filters
EP0033473A2 (en) * 1980-01-30 1981-08-12 Siemens Aktiengesellschaft Current controlled oscillator
EP0140429A1 (en) * 1983-10-07 1985-05-08 Philips Electronics Uk Limited Voltage controlled oscillator

Also Published As

Publication number Publication date
GB8917675D0 (en) 1989-09-20
GB2234643A (en) 1991-02-06

Similar Documents

Publication Publication Date Title
GB2234644B (en) Modulator circuit
GB2228840B (en) Frequency synthesisers
GB2232328B (en) Quadrature modulator
EP0412491A3 (en) Frequency synthesizer
EP0419680A4 (en) Frequency modulator
EP0409374A3 (en) Microwave elements
EP0432052A3 (en) Rf modulator
EP0427092A3 (en) Electro-optic modulator
GB2217536B (en) Frequency counter
EP0351153A3 (en) Frequency modulator
EP0414548A3 (en) Low frequency restorer
EP0409277A3 (en) Frequency modulator
GB2236922B (en) Frequency synthesisers
GB2237698B (en) Noncommensurate line length rf modulator
GB2238424B (en) Magnetrons
EP0429858A3 (en) Reference frequency generator
GB8905920D0 (en) Frequency synthesisers
GB8716385D0 (en) Frequency synthesisers
GB8920335D0 (en) Frequency mixers
CS245290A2 (en) Pressure modulator
GB2234643B (en) Frequency modulator
PT89938A (en) FREQUENCY MODULATOR
GB8922144D0 (en) Magnetrons
GB8923322D0 (en) Magnetrons
GB2466233B (en) Frequency synthesizer

Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20030802