JPS5657313A - Balanced modulator - Google Patents

Balanced modulator

Info

Publication number
JPS5657313A
JPS5657313A JP13403179A JP13403179A JPS5657313A JP S5657313 A JPS5657313 A JP S5657313A JP 13403179 A JP13403179 A JP 13403179A JP 13403179 A JP13403179 A JP 13403179A JP S5657313 A JPS5657313 A JP S5657313A
Authority
JP
Japan
Prior art keywords
signal
level
increase
modulation distortion
trs
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
Application number
JP13403179A
Other languages
Japanese (ja)
Other versions
JPS6243561B2 (en
Inventor
Kenzo Tanabe
Masashi Sugano
Junji Suzuki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP13403179A priority Critical patent/JPS5657313A/en
Priority to CA000362445A priority patent/CA1155927A/en
Priority to DE19803038995 priority patent/DE3038995A1/en
Publication of JPS5657313A publication Critical patent/JPS5657313A/en
Publication of JPS6243561B2 publication Critical patent/JPS6243561B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
    • H03C1/54—Balanced modulators, e.g. bridge type, ring type or double balanced type
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/14—Balanced arrangements
    • H03D7/1408—Balanced arrangements with diodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/14—Balanced arrangements
    • H03D7/1425—Balanced arrangements with transistors
    • H03D7/1433—Balanced arrangements with transistors using bipolar transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/14—Balanced arrangements
    • H03D7/1425—Balanced arrangements with transistors
    • H03D7/145—Balanced arrangements with transistors using a combination of bipolar transistors and field-effect transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/14—Balanced arrangements
    • H03D7/1425—Balanced arrangements with transistors
    • H03D7/1458—Double balanced arrangements, i.e. where both input signals are differential
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/14—Balanced arrangements
    • H03D7/1425—Balanced arrangements with transistors
    • H03D7/1491—Arrangements to linearise a transconductance stage of a mixer arrangement
    • 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
    • H03D2200/0033—Current mirrors
    • 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
    • H03D2200/0043—Bias and operating point

Abstract

PURPOSE: To reduce the cross modulation distortion and the mutual modulation distortion, by increasing the bias current to the balanced modulator circuit according to the increase of the input level of the signal and at the same time reducing the level of the local oscillation signal.
CONSTITUTION: The transistors (TR)Q17∼Q20, Q15 and Q16 plus resistor R14 form a double modulator circuit; while the TRs Q13 and Q14 form the constant current source to the TRs Q15 and Q16, respectively. The voltage which is applied to the input terminal 23 and varies in a DC way increases in the positive direction according to the increase of the signal input voltage supplied from the antenna and applied to the input terminal 20. Thus the bias current of the TRs Q15 and Q16 increases according to the increase of the signal input voltage. As a result, the input level increases for the maximum allowable signal. At the same time, the local oscillation injection level to be injected to the double balanced modulator circuit through the input terminal 19 lowers down with reduction of the AC impedance of the FETQ9. Thus the frequency conversion conductance is lowered. Thus both the cross modulation distortion and the mutual modulation distortion, which are caused by the increase of the intermediate frequency signal level at the output terminal 21, can be reduced.
COPYRIGHT: (C)1981,JPO&Japio
JP13403179A 1979-10-16 1979-10-16 Balanced modulator Granted JPS5657313A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP13403179A JPS5657313A (en) 1979-10-16 1979-10-16 Balanced modulator
CA000362445A CA1155927A (en) 1979-10-16 1980-10-15 Balanced modulator
DE19803038995 DE3038995A1 (en) 1979-10-16 1980-10-15 Balanced mixer for radio receiver - reduces distortion in modulator over wide range of signal amplitudes using emitter-coupled transistor pairs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13403179A JPS5657313A (en) 1979-10-16 1979-10-16 Balanced modulator

Publications (2)

Publication Number Publication Date
JPS5657313A true JPS5657313A (en) 1981-05-19
JPS6243561B2 JPS6243561B2 (en) 1987-09-16

Family

ID=15118750

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13403179A Granted JPS5657313A (en) 1979-10-16 1979-10-16 Balanced modulator

Country Status (3)

Country Link
JP (1) JPS5657313A (en)
CA (1) CA1155927A (en)
DE (1) DE3038995A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61105912A (en) * 1984-10-30 1986-05-24 Mitsubishi Electric Corp Mixer circuit

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1211106B (en) * 1981-09-16 1989-09-29 Ates Componenti Elettron TRANSISTOR AMPLIFIER AND MIXER INPUT STAGE FOR A RADIO RECEIVER.
JPS58171105A (en) * 1982-03-31 1983-10-07 Toshiba Corp Amplitude modulator
NL8503435A (en) * 1985-12-13 1987-07-01 Philips Nv UHF AMPLIFIER MIXING CIRCUIT.
JPS63294822A (en) * 1987-05-27 1988-12-01 求　政治 Automatic tableware washer
DE10239856A1 (en) * 2002-08-29 2004-03-11 Infineon Technologies Ag Circuit arrangement with frequency converter
DE10351115A1 (en) * 2003-11-03 2005-05-25 Deutsche Thomson-Brandt Gmbh Controllable mixer e.g. for suppression of signals in receiver, has transistor, oscillator signal and input signal with input signal covers information signal and further signals where output of mixer is supplied
US7865157B2 (en) 2003-11-03 2011-01-04 Thomson Licensing Controllable mixer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61105912A (en) * 1984-10-30 1986-05-24 Mitsubishi Electric Corp Mixer circuit

Also Published As

Publication number Publication date
CA1155927A (en) 1983-10-25
JPS6243561B2 (en) 1987-09-16
DE3038995A1 (en) 1981-05-14

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