Oscillator mixer circuit with reaction-tree coupling

Claim 2

An oscillator and mixer circuit arrangement of an integrated UHF/VHF modulator circuit, comprising a single oscillator active circuit to be connected to frequency-determining passive circuits for UHF and multichannel VHF operation, a single mixer circuit for mixing an oscillator signal from said active oscillator circuit with a signal to be mixed with the oscillator signal, and a reaction-free coupling connected between said single oscillator active circuit and said single mixer circuit.

Claim 3

A modulator circuit according to claim 1, wherein said signal to be mixed with the oscillator signal is a video signal.

Claim 4

A modulator circuit according to claim 1, wherein said signal to be mixed with the oscillator signal is an audio signal.

Claim 5

A modulator circuit according to claim 1, wherein said signal to be mixed with the oscillator signal is a video and audio signal.

Claim 6

A modulator circuit according to claim 1, wherein said active oscillator circuit has an output, said mixer circuit has an input, and said reaction-free coupling is a buffer stage having an input capacitively coupled without reaction to said output of said active oscillator circuit, and an output connected to said input of said mixer part.

Claim 7

An oscillator and mixer circuit arrangement of an integrated UHF/VHF modulator circuit, comprising a single oscillator active circuit to be connected to frequency-determining passive circuits for UHF and multichannel VHF operation, a single mixer circuit for mixing an oscillator signal from said active oscillator circuit with a signal to be mixed with the oscillator signal, and a reaction-free coupling connected between said single oscillator active circuit and said single mixer circuit; wherein said reaction-free coupling is an integrated capacity device formed of a series circuit of an MOS capacity and a barrier layer capacity.

Claim 8

An oscillator and mixer circuit arrangement of an integrated UHF/VHF modulator circuit, comprising a single oscillator active circuit to be connected to frequency-determining passive circuits for UHF and multichannel VHF operation, a single mixer circuit for mixing an oscillator signal from said active oscillator circuit with a signal to be mixed with the oscillator signal, and a reaction-free coupling connected between said single oscillator active circuit and said single mixer circuit; wherein said reaction-free coupling is an integrated capacity device formed of a series circuit of an MOS capacity and a barrier layer capacity.

Claim 9

A modulator circuit according to claim 6, wherein said MOS capacity is formed of a semiconductor body containing an integrated circuit, an insulating passivating layer disposed on said semiconductor body as a dielectric, and a conductor run disposed on said insulating passivating layer; and said barrier layer capacity is formed by at least one pn-junction between a doped zone disposed in said semiconductor body and said semiconductor body.

Claim 10

A modulator circuit according to claim 7, including terminals connected to said active oscillator circuit for the frequency-determining passive circuits, and output terminals connected to said mixer circuit.

Claim 11

A modulator circuit according to claim 6, including a high-resistance branch connecting said barrier layer capacity to a reference potential.

Claim 12

A modulator circuit according to claim 7, including a high-resistance branch connecting said barrier layer capacity to a reference potential.

Claim 13

An oscillator and mixer circuit arrangement of an integrated UHF/VHF modulator circuit, comprising a single oscillator active circuit to be connected to frequency-determining passive circuits for UHF and multichannel VHF operation, a single mixer circuit for mixing an oscillator signal from said active oscillator circuit with a signal to be mixed with the oscillator signal, and a reaction-free coupling connected between said single oscillator active circuit and said single mixer circuit; wherein said active oscillator circuit has an output, said mixer circuit has an input, and said reaction-free coupling is a buffer stage having an input capacitively coupled without reaction to said output of said active oscillator circuit, and an output connected to said input of said mixer part; wherein said reaction-free coupling is an integrated capacity device formed of a series circuit of an MOS capacity and a barrier layer capacity.

Claim 14

An oscillator and mixer circuit arrangement of an integrated UHF/VHF modulator circuit, comprising a single oscillator active circuit to be connected to frequency-determining passive circuits for UHF and multichannel VHF operation, a single mixer circuit for mixing an oscillator signal from said active oscillator circuit with a signal to be mixed with the oscillator signal, and a reaction-free coupling connected between said single oscillator active circuit and said single mixer circuit; wherein said active oscillator circuit has an output, said mixer circuit has an input, and said reaction-free coupling is a buffer stage having an input capacitively coupled without reaction to said output of said active oscillator circuit, and an output connected to said input of said mixer part; wherein said reaction-free coupling is an integrated capacity device formed of a series circuit of an MOS capacity and a barrier layer capacity.

Claim 15

A modulator circuit according to claim 8, wherein said MOS capacity is formed of a semiconductor body containing an integrated circuit, an insulating passivating layer disposed on said semiconductor body as a dielectric, and a conductor rn disposed on said insulating passivating layer; and said barrier layer capacity is formed by at least one pn-junction between a doped zone disposed in said semiconductor body and said semiconductor body.

Claim 16

A modulator circuit according to claim 12, including terminals connected to said active oscillator circuit for the frequency-determining passive circuits, and output terminals connected to said mixer circuit.

Claim 17

A modulator circuit according to claim 11, including a high-resistance branch connecting said barrier layer capacity to a reference potential.

Claim 18

A modulator circuit according to claim 12, including a high-resistance branch connecting said barrier layer capacity to a reference potential.