EP0124949A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Mixer arrangement comprising first and second quadrature mixer stages
Assignee: Koninklijke Philips NV
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Filing: 1984-05-07
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Granted: —
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Expires: 2004-05-07
Abstract
Abstract Mixer arrangement (M) comprising first and second quadrature mixer stages (M, resp. M 2 ) to which quadrature mixing signals are applied from an oscillator circuit (Fo), these two mixer stages (M, and M 2 ) being coupled to a superposition circuit (So). To suppress interferences occurring in the output signal of the superposition circuit due to oscillator crosstalk or leakage and/or a d.c. offset of the mixer stages (M, and M 2 ) which are supplied with mixing signals by the oscillator circuit Fa, the quadrature components of these interferences being in phase with the quadrature mixing signals are measured by means of first and second synchronous detectors (SD 1 resp. SD 2 ) to which detection carriers are applied in an in-phase or an anti-phase relationship with respect to the quadrature mixing signals. After sign inversion these quadrature components are fed back to the inputs of the two mixer stages (M, and M 2 ), resulting in an interference negative feedback.
Inventors
- 👤 Wolfdietrich Georg Kasperkovitz
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 09:03
CPC Classifications
H; H03; H03D; H03D7/00; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/30; H04B1/302; H03D3/00; H03D3/007; H03D3/008; H03D7/16; H03D7/165; H03D7/166; H03D2200/00; H03D2200/0041; H03D2200/0047; H03D7/161
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
177 words
A mixer arrangement comprising first and second mixer stages, to which quadrature mixing signals are applied from an oscillator circuit, these two mixer stages being coupled to a superposition circuit, characterized by first and second Quadrature interference negative feedback paths for a negative feedback of oscillator frequency-coupled interferences from an output of the superposition circuit to inputs of the two mixer stages, comprising first and second synchronous detectors, respectively coupled to the output of the superposition circuit and also via first and second low-pass filters to inputs of the first and second mixer stages, quadrature carriers which are in an in-phase or an anti-phase relationship with the quadrature mixing signals being applied to these synchronous detectors from the oscillator circuit, whereas for the case in which there is an in-phase relationship between at least one of the said carriers and one of the said mixing signals the interference negative feedback paths in which the synchronous detector which is fed by the last-mentioned carrier is included also comprises an inverter circuit for inverting the sign of the signal.
Claim 2
Dependent Claim
177 words
A mixer arrangement comprising first and second mixer stages, to which quadrature mixing signals are applied from an oscillator circuit, these two mixer stages being coupled to a superposition circuit, characterized by first and second Quadrature interference negative feedback paths for a negative feedback of oscillator frequency-coupled interferences from an output of the superposition circuit to inputs of the two mixer stages, comprising first and second synchronous detectors, respectively coupled to the output of the superposition circuit and also via first and second low-pass filters to inputs of the first and second mixer stages, quadrature carriers which are in an in-phase or an anti-phase relationship with the quadrature mixing signals being applied to these synchronous detectors from the oscillator circuit, whereas for the case in which there is an in-phase relationship between at least one of the said carriers and one of the said mixing signals the interference negative feedback paths in which the synchronous detector which is fed by the last-mentioned carrier is included also comprises an inverter circuit for inverting the sign of the signal.
Claim 3
Dependent Claim
92 words
A mixer arrangement as claimed in Claim 1, characterized by an in-phase relationship between the two carriers and the two mixing signals, by first and second subtracting circuits whose inverting inputs are coupled to the first and second low-pass filters, respectively, whose non-inverting inputs are coupled to first and second quadrature inputs of the mixer arrangement, respectively and whose outputs are coupled to the inputs of the first and the second mixer stages, respectively and in that the output of the superposition circuit is connected to an output of the mixer arrangement.
Claim 4
Dependent Claim
59 words
A mixer arrangement as claimed in Claim 1, characterized by a further mixer stage to which a further mixing signal is applied from the oscillator circuit, an input of the mixer arrangement being coupled to an input of the third mixer stage and an output of the third mixer stage being connected to an input of the superposition circuit.
Claim 5
Dependent Claim
23 words
A mixer arrangement as claimed in Claim 3, characterized by a frequency-dividing circuit arranged between the further mixer stage and the oscillator circuit.
Claim 6
Dependent Claim
57 words
A mixer arrangement as claimed in Claim 1, characterized by a further mixer stage to which a mixing signal is applied from the oscillator circuit, an output of the third mixer stage being coupled to an output of the mixer arrangement and an input being coupled to an input of the mixer arrangement via the superposition circuit.
References Cited (Backward Citations)
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