Phase shift circuit

Claim 2

A phase shift circuit used in a regenerating repeater, comprising: a separating means for separating an input signal into two separate signals having a phase difference of a phase angle of 90° therebetween, one separated signal having a "0" phase and the other separated signal having a "π/2" phase; a distributing means for distributing said "0" phase separated signal and "π/2" phase separated signal as three distributed signals having a phase difference of phase angles of 90° and 180° there­between, one distributed signal having a "0" phase and the two other distributed signals having a "π/2" phase and a "π" phase, respectively; and a weighting/compounding means for analyzing said "0" phase distributed signal, "π/2" phase distributed signal and "π" phase distributed signal regarding a plurality of phase signals each having a phase shift extent, for compounding each of said phase signals after being weighted by an amplitude, said weighting being performed by a weight control signal applied from an external stage, and for generating an output signal adding a phase shift proportional to said weight to said input signal.

Claim 3

A phase shift circuit as claimed in claim 1, wherein said distributing means comprising a first and a second distributing units inputting the "0" phase separated signal and the "π/2" phase separated signal; and said weighting/compounding means comprises a first weighting/compounding unit inputting an "0" phase distributed signal and a "π/2" phase distributed signal and outputting two phase signals having a phase shift extent of from 0° to 90° and from 180° to 270°, a second weighting/compounding unit inputting a "π/2" phase distributed signal and a "π" phase distributed signal and outputting a phase signal having a phase shift extent of from 90° to 180°, a third weighting/com­pounding unit inputting two phase signals having a phase shift extent of from 0° to 90° and from 90° to 180° and outputting two phase signals having a phase shift extent of from 0° to 180° and from 180° to 360°, a fourth weighting/compounding unit inputting two phase signals having a phase shift extent of from 90° to 180° and from 180° to 270° and outputting a phase signal having a phase shift extent of from 90° to 270°, a fifth weight­ing/compounding unit inputting two phase signals having a phase shift extent of from 0° to 180° and from 90° to 270° and outputting a phase signal having a phase shift extent of from 0° to 270°, a sixth weighting/compounding unit inputting two phase signals having a phase shift extent of from 90° to 270° and from 180° to 360° and outputting a phase signal having a phase shift extent of from 90° to 360°, and a seventh weighting/compounding unit inputting two phase signals having a phase shift extent of from 0° to 270° and from 90° to 360° and outputting a phase signal having a phase shift extent of from 0° to 360°.

Claim 4

A phase shift circuit as claimed in claim 1, wherein said separating means comprising a first CR circuit consisting of a series-connected resistor and capacitor, and a second CR circuit consisting of a series-connected resistor and capacitor, said first and second CR circuit being connected in series, said input signal being input to a common connection point of said first CR circuit and second CR circuit, said "0" phase separated signal being output from a common connection point of said resistor and capacitor in the first CR circuit, and said "π/2" phase separated signal being output from a common connection point of said resistor and capacitor in the second CR circuit.

Claim 5

a phase shift circuit as claimed in claim 2, wherein each of said first and second distributing units comprises a differential amplifier having a pair of transistors, said separating signal being input to a base of one transistor, a reference voltage being to a base of the other transistor, and said distributing signal being output from any collector of said pair of transistor.

Claim 6

A phase shift circuit as claimed in claim 2, wherein each of said first and second distributing units comprises a transistor, said separating signal being input to a base of said transistor, and said distrib­uting signal being output from either a collector or an emitter of said transistor.

Claim 7

A phase shift circuit as claimed in claim 2, wherein each of said first to seventh weighting/com­pounding units comprises a first differential amplifier, a second differential amplifier connected in parallel to said first differential amplifier through each col­lector, and a third differential amplifier connected to said first differential amplifier and second differen­tial amplifier for taking weight currents through each of emitters of said first differential amplifier and second differential amplifier, said distributing signal being input to each base of said first differential amplifier and second differential amplifier, said reference voltage being applied to the other of each base of said first differential amplifier and second differential amplifier, said weight control signal being input to a base of third differential amplifier, the other reference voltage being applied to the other base of said third differential amplifier, and said phase signal being output from each collector of said first differential amplifier and second differential ampli­fier.

Claim 8

A phase shift circuit as claimed in claim 2, wherein each of said first to seventh weighting/com­pounding units comprises, a pair of transistor inputting said distributing signal to each base of said transistor and outputting said phase signal from each collector of said transistor, and semifixed-resistors each connected to each emitter of said transistor for adjusting said weight current passing through said transistor.

Claim 9

A phase shift circuit as claimed in claim 6, wherein an amplitude fluctuation compensating unit for suppressing the amplitude fluctuation of said phase signal is provided to a common emitter of said third differential amplifier.

Claim 10

A phase shift circuit as claimed in claim 8, wherein said amplitude fluctuation compensating unit comprising a current source circuit connected to said common emitter of said third differential amplifier, and a compensation control circuit connected to said current source circuit and outputting a compensation control voltage to said current source circuit for controlling said weight current based on a voltage of said weight control signal and a reference voltage.

Claim 11

A phase shift circuit as claimed in claim 9, wherein said compensation control circuit comprises a differential amplifier constituted by a pair of tran­sistors, and inputting said weight control signal to a base of one of said transistors and inputting said reference voltage to a base of the other of said tran­sistors, and a voltage combining circuit constituted by two transistors for receiving each collector voltage of said differential amplifier and for outputting said compensation control voltage.

Claim 12

A phase shift circuit as claimed in claim 3, wherein said separating means comprises, an RC phase circuit constituted by variable capacitors and fixed resistors, or by fixed capacitors and variable resistors, and inputting said input signal and output­ting said separating signal; and a comparing circuit inputting said input signal and outputting said sepa­rating signal, comparing these signals, and outputting a control voltage to said RC phase circuit to obtain a predetermined ratio between said input signal and said separating signal.

Claim 13

A phase shift circuit as claimed in claim 11, wherein said RC phase circuit comprises a first RC circuit having a resistor and a variable capacitor connected in series to said resistor, and a second RC circuit having a resistor and a variable capacitor connected in series to said resistor, said first RC circuit and second RC circuit being connected in series, said input signal being input to a common connection point of said first RC circuit and second RC circuit, one separating signal being output from said first RC circuit, and the other separating signal being output from said second RC circuit; and said comparing circuit having a peak detecting circuit for detecting said separating signal and outputting a peak voltage, a coefficient circuit for inputting said input signal and outputting a 1/√2 voltage of said input signal, and an error detecting circuit for inputting said peak voltage and 1/√2 voltage and outputting said control signal to said variable capacitors in common.

Claim 14

A phase shift circuit having a phase shift extent of from 0° to 90° comprising a separating unit for separating an input signal into two separate signals having a phase difference of 90° therebetween, and a weighting/compounding unit inputting said two separated signals and outputting an output signal having a phase shift extent of from 0° to 90° based on a weight control signal.

Claim 15

A phase shift circuit having a phase shift extent of from 0° to 90° comprising a separating unit for separating an input signal into two separate signals having a phase difference of 90° therebetween, and a weighting/compounding unit inputting said two separated signals and outputting an output signal having a phase shift extent of from 0° to 90° based on a weight control signal.

Claim 16

A phase shift circuit having a phase shift extent of from 0° to 180° comprising a separating unit for separating an input signal into two separate signals having a phase difference of 90° therebetween, a first distributing unit inputting a "0" phase separated signal (0°s-signal) and outputting a "0" phase distributed signal (0°d-signal) and 180°d-signal, a second distrib­ uting unit inputting a 90°s-signal and outputting a 90°d-signal, a first weighting/compounding unit input­ting 0° to 90°d-signals and outputting a phase signal having a phase shift extent of from 0° to 90°, a second weighting/compounding unit inputting 90° and 180°d-­signals and outputting a phase signal having a phase shift extent of from 90° to 180°, and a third weight­ing/compounding unit inputting one phase signal having a phase shift extent of from 0° to 90° and another phase signal having a phase shift extent of from 90° to 180°, and outputting a phase signal having a phase shift extent of from 90° to 180°, and said weight control signal being input to said first, second and third weighting/compounding unit for controlling said weight current.

Claim 17

A phase shift circuit having a phase shift extent of from 0° to 180° comprising a separating unit for separating an input signal into two separate signals having a phase difference of 90° therebetween, a first distributing unit inputting a "0" phase separated signal (0°s-signal) and outputting a "0" phase distributed signal (0°d-signal) and 180°d-signal, a second distrib­ uting unit inputting a 90°s-signal and outputting a 90°d-signal, a first weighting/compounding unit input­ting 0° to 90°d-signals and outputting a phase signal having a phase shift extent of from 0° to 90°, a second weighting/compounding unit inputting 90° and 180°d-­signals and outputting a phase signal having a phase shift extent of from 90° to 180°, and a third weight­ing/compounding unit inputting one phase signal having a phase shift extent of from 0° to 90° and another phase signal having a phase shift extent of from 90° to 180°, and outputting a phase signal having a phase shift extent of from 90° to 180°, and said weight control signal being input to said first, second and third weighting/compounding unit for controlling said weight current.

Claim 18

A phase shift circuit having a phase shift extent of from 0° to 90° x n° comprising a separating unit for inputting an input signal and outputting 0° and 90°d-signals, a first distributing unit for input­ting 0°s-signal and outputting 0° and 180°d-signals, a second distributing unit for inputting 90°s-signal, "n-1" pairs of weighting/compounding units inputting 0°, 90°, 180°d-signals and outputting phase signals having phase shift extents of from 0° to 90 x (n-1)° and from 90° to 90 x n°, and an n'th weighting/compounding unit inputting phase signals having phase shift extents of from 0° to 90 x (n-1)° and from 90° to 90 x n° and outputting a phase signal having a phase shift extent of from 0° to 90 x n°.

Claim 19

A phase shift circuit having a phase shift extent of from 0° to 90° x n° comprising a separating unit for inputting an input signal and outputting 0° and 90°d-signals, a first distributing unit for input­ting 0°s-signal and outputting 0° and 180°d-signals, a second distributing unit for inputting 90°s-signal, "n-1" pairs of weighting/compounding units inputting 0°, 90°, 180°d-signals and outputting phase signals having phase shift extents of from 0° to 90 x (n-1)° and from 90° to 90 x n°, and an n'th weighting/compounding unit inputting phase signals having phase shift extents of from 0° to 90 x (n-1)° and from 90° to 90 x n° and outputting a phase signal having a phase shift extent of from 0° to 90 x n°.

Claim 20

A phase shift circuit having a phase shift extent of from 0° to 90 x n° comprising "n" pairs of a separating unit and weighting/compounding unit, each pair being connected in series, and an input signal being input to a first separating unit and a phase signal having a phase shift extent of from 0° to 90 x n° being output from said n'th weighting/compounding unit.

Claim 21

A phase shift circuit having a phase shift extent of from 0° to 90 x n° comprising "n" pairs of a separating unit and weighting/compounding unit, each pair being connected in series, and an input signal being input to a first separating unit and a phase signal having a phase shift extent of from 0° to 90 x n° being output from said n'th weighting/compounding unit.

Claim 22

A phase shift circuit as claimed in claim 3, wherein said separating unit comprises three SAW filters, one SAW filter being used for inputting an input signal, and said other two SAW filters being used for outputting 0° and 90°s-signals.

Claim 23

An automatic phase control circuit comprising, a discriminating circuit for inputting data, a phase comparing circuit for comparing the input data with an output data and outputting a phase detecting signal, a reference voltage generating circuit for generating a reference voltage, a phase difference detecting circuit inputting the phase detecting signal and the reference voltage and outputting a control voltage, and a phase shift circuit inputting the reference voltage as the weight control signal and outputting a clock signal to said discriminating circuit.

Claim 24

An automatic phase control circuit comprising, a discriminating circuit for inputting data, a phase comparing circuit for comparing the input data with an output data and outputting a phase detecting signal, a reference voltage generating circuit for generating a reference voltage, a phase difference detecting circuit inputting the phase detecting signal and the reference voltage and outputting a control voltage, and a phase shift circuit inputting the reference voltage as the weight control signal and outputting a clock signal to said discriminating circuit.