JPS57127306A - Phase comparator - Google Patents

Phase comparator

Info

Publication number
JPS57127306A
JPS57127306A JP1274481A JP1274481A JPS57127306A JP S57127306 A JPS57127306 A JP S57127306A JP 1274481 A JP1274481 A JP 1274481A JP 1274481 A JP1274481 A JP 1274481A JP S57127306 A JPS57127306 A JP S57127306A
Authority
JP
Japan
Prior art keywords
current
input signal
phase
reduce
output
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.)
Pending
Application number
JP1274481A
Other languages
Japanese (ja)
Inventor
Hiromi Kusakabe
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP1274481A priority Critical patent/JPS57127306A/en
Publication of JPS57127306A publication Critical patent/JPS57127306A/en
Pending legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manipulation Of Pulses (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To reduce the output offset, by setting a phase comparing part to a B- or AB-class operation to reduce the bias current while no signal is delivered as well as to reduce the peak current of the input signal. CONSTITUTION:Each working current of transistors (TR)Q17 and Q18 in current mirror circuits CM1 and CM2 which serve also as differential amplifiers of a phase comparing part 12 operates an AB- or B-class operation in which the peak current on the input signal supplied from an input signal source for phase to be compared is reduced by a bias part 11. As a result, the mean value of an output current is set at zero through an LPF in case when the frequency of a switching signal is higher than the frequency of the input signal for phase to be compared. Thus the unbalance of a current mirror circuit CM3 comprising TRS Q23 and Q24 emerges int the form of an unbalance component of an output current waveform to be changed into a waveform having the upper and lower parts asymmetric to each other. This error component is turned into an output offset. In this case, a large DC current does not flow due to the AB- or B-class operation, and accordingly the output offset can be reduced by a degree equivalent to the DC current.
JP1274481A 1981-01-30 1981-01-30 Phase comparator Pending JPS57127306A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1274481A JPS57127306A (en) 1981-01-30 1981-01-30 Phase comparator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1274481A JPS57127306A (en) 1981-01-30 1981-01-30 Phase comparator

Publications (1)

Publication Number Publication Date
JPS57127306A true JPS57127306A (en) 1982-08-07

Family

ID=11813924

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1274481A Pending JPS57127306A (en) 1981-01-30 1981-01-30 Phase comparator

Country Status (1)

Country Link
JP (1) JPS57127306A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59146203A (en) * 1983-02-09 1984-08-22 Rohm Co Ltd Current mirror circuit for phase comparison circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59146203A (en) * 1983-02-09 1984-08-22 Rohm Co Ltd Current mirror circuit for phase comparison circuit

Similar Documents

Publication Publication Date Title
CA2068420A1 (en) Controlled slew rate amplifier
JPS57207405A (en) Broad band negative feedback amplifying circuit
JPS57127306A (en) Phase comparator
JPS5657313A (en) Balanced modulator
JPS555552A (en) Dc reproducing circuit
JPS5597875A (en) Transistor direct current power supply for welding
JPS5646314A (en) Equalizing amplifier
JPS56107609A (en) Push-pull amplifying circuit
GB1451267A (en) Gyrator resonant circuit
JPS5494827A (en) Adjusting circuit for video quality
JPS57133707A (en) Bias circuit for power amplifier
SE9901839D0 (en) A soft start circuit
JPS54100654A (en) Am detection circuit
JPS55135408A (en) Integrated circuit for pre-emphasis
JPS57199396A (en) Speaker input controlling circuit
JPH10341114A (en) Power supply voltage changeover device for amplifier
JPS647719A (en) Transmitting power control circuit
JPS57132276A (en) Method for waveform correction of integrated curcuit
JPS5717207A (en) Amplifying circuit
JP2577946B2 (en) Amplifier circuit
JPH0546089Y2 (en)
JPS57110073A (en) Phase control device for thyristor
JPS57141107A (en) Wide-band negative feedback amplifying circuit
JPS55112016A (en) Level control circuit
JPS5689106A (en) Negative feedback amplifying circuit