US 6,888,416 B2Granted

Oscillator/mixer circuit having reduced area requirement when produced on a chip

AssigneeInfineon Technologies AG

InventorDieter Sewald

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Abstract

An oscillator/mixer circuit having a reduced area requirement when producing it on a chip and where the circuit's mixer circuit is not based on the use of the nonlinear characteristic curve of an active component. The preferred embodiment of the oscillator/mixer circuit comprises an oscillator circuit; a mixer circuit, wherein the oscillator and mixer circuits have the same components to some extent and wherein the mixer circuit has at least a first switch element and a second switch element. An output of the first switch element is coupled to a control input of the second switch element via a first feedback element. An output of the second switch element is coupled to a control input of the first switch element via a second feedback element. The feedback elements are set up allow oscillator operation of the oscillator/mixer circuit.

Claims10

Dependent claims

An oscillator/mixer circuit comprising:

an oscillator circuit, and
a switching mixer circuit,
in which the oscillator circuit and the switching mixer circuit have the same components to some extent,
in which the switching mixer circuit has at least a first switch element having an input, an output and a control input, a second switch element having an input, an output and a control input and a third switch element having an output and a control in input,
where the output of the first switch element is coupled to the control input of the second switch element via a first feedback element,
where the output of the second switch element is coupled to the control input of the first switch element via a second feedback element,
where the feedback elements are set up such that the oscillator operation of the oscillator/mixer circuit is made possible,
where the control input of the third switch element is connected to a mixing signal input, to which a signal to be mixed can be applied,
where the output of the third switch element is connected to the input of the first switch element and the input of the second switch element.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/169,010Filed 19 Dec 2000
Priority: DE 199 61 53420 Dec 1999
Published: US 2004/0130403 A18 Jul 2004
Granted: 3 May 2005
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H03D 7/1408
Balanced arrangements: with diodes
H03B 5/1215
The amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a…
H03B 5/1228
Active element in amplifier being semiconductor device: the amplifier comprising one or more field effect transistors
H03B 5/1253
The means comprising transistors used to provide a variable capacitance: the transistors being field-effect transistors