Transistor oscillator utilizing clapp circuit configuration for operation in the microwave band

Claim 2

In a transistor oscillator for the microwave band, utilizing CLAPP circuit configuration, the combination of a small capacitance in series with the collector-base capacitance and disposed between the base and ground, said additional capacitance comprising a line section open at the end, the electrical length of which line is smaller than λ/4.

Claim 3

In a transistor oscillator, constructed in strip-line technique, for the microwave range, utilizing CLAPP-circuit configuration, having a capacitive voltage divider comprising the collector-emitter capacitance and the emitter-base capacitance, and provided with an adjustable capacitance connected in series with the resonant circuit inductance in the collector circuit, with the collector-base capacitance forming a part of the capacitance reactance of the frequency-determining elements of the oscillator circuit, the combination of an additional small capacitance disposed between the transistor base and ground and connected in series with the collector-base capacitance, operative to reduce the effective circuit capacitance and thereby increase the oscillator frequency, and line sections of λ/4 in length forming the direct current feed to the transistor, of which the end connected to the voltage source is short-circuited over a blocking condensor.

Claim 4

In a transistor oscillator, constructed in strip-line technique, for the microwave range, utilizing CLAPP-circuit configuration, having a capacitive voltage divider comprising the collector-emitter capacitance and the emitter-base capacitance, and provided with an adjustable capacitance connected in series with the resonant circuit inductance in the collector circuit, with the collector-base capacitance forming a part of the capacitance reactance of the frequency-determining elements of the oscillator circuit, the combination of an additional small capacitance disposed between the transistor base and ground and connected in series with the collector-base capacitance, operative to reduce the effective circuit capacitance and thereby increase the oscillator frequency, and line sections of λ/4 in length forming the direct current feed to the transistor, of which the end connected to the voltage source is short-circuited over a blocking condensor.

Claim 5

A transistor oscillator according to claim 2, in which the alterable capacitance in the collector circuit is a voltage-dependent adjustable capacitance, wherein said voltage-dependent capacitance is connected to a direct current feed by line sections of λ/4 in length, of which the end connected to the voltage source is short-circuited over a blocking condensor.

Claim 6

A transistor oscillator according to claim 3, wherein one of said line sections of λ/4 in length is common to the direct current feed of both the transistor and the voltage-dependent capacitance.

Claim 7

A transistor oscillator according to claim 2, wherein the additional capacitance consists of a line section open at the end, the electrical length of which line is smaller than λ/4.

Claim 8

A transistor oscillator according to claim 5, in which the alterable capacitance in the collector circuit is a voltage-dependent adjustable capacitance, wherein said voltage-dependent capacitance is connected to a direct current feed by line sections of λ/4 in length, of which the end connected to the voltage source is short-circuited over a blocking condensor.

Claim 9

A transistor oscillator according to claim 6, wherein one of said line sections of λ/4 in length is common to the direct current feed of both the transistor and the voltage-dependent capacitance.

Claim 10

A transistor oscillator according to claim 2, wherein the additional capacitance comprises a trimming capacitor.

Claim 11

A transistor oscillator according to claim 2, wherein the additional capacitance is formed by varactor elements.

Claim 12

A transistor oscillator according to claim 9, in which the alterable capacitance in the collector-circuit is a voltage-dependent adjustable capacitance, wherein said voltage-dependent capacitance is connected to a direct current feed by line sections of λ/4 in length, of which the end connected to the voltage source is short-circuited over a blocking condensor.

Claim 13

A transistor oscillator according to claim 10, wherein one of said line sections of λ/4 in length is common to the direct current feed of both the transistor and the voltage-dependent capacitance.