Frequency multiplier

Claim 2

A frequency multiplier comprising; (a) multiplying means, having an input and an output, for providing an output signal at the output, the output signal having a frequency of an odd multiple of a frequency of a signal fed to the input thereof; and (b) an amplifier circuit comprising: (i) a first amplifier having an input and an output, the input coupled to the output of the multiplier means; (ii) an attenuator, having an input port, an output port and a control port, the input port fed by the output of the first amplifier; (iii) means for providing an intermediate control signal in response to variations in an output signal fed from the outpu of the first amplifier; (iv) means for providing a reference signal, the reference signal indicative of ambient temperature of the amplifier circuit; and (v) means, fed by the reference signal and the intermediate control signal, for providing a control signal to the control port for minimizing variations of signal level in an output signal at the output port of the attentuator.

Claim 3

The frequency multiplier as recited in claim 1 wherein the multiplier means comprises a pair of diodes, each one of the pair of diodes having an anode and a cathode, with the anode of each diode connected to the cathode of the other diode.

Claim 4

The frequency multiplier as recited in claim 2 further comprising a highpass filter having an input and an outpu with the input of the highpass filter connected to the output of the multiplier means and the output of the highpass filter connected to the input of the amplifier circuit.

Claim 5

The frequency multiplier as recited in claim 3 further comprising an input amplifier having an input and an output, the output of the input amplifier coupled to the input of the multiplier means.

Claim 6

The frequency multiplier as recited in claim 4 further comprising a matching network having an input and an output, the input of the matching network connected to the output of the input amplifier and the output of the matching network connected to the input of the multiplier means.

Claim 7

The frequency multiplier as recited in claim 5 further comprising a second amplifier having an input and an output, the input of the amplifier fed by the output port of the attentuator.

Claim 8

The frequency multiplier as recited in claim 6 wherein the means for providing an intermediate control signal comprises: (a) a detector circuit having an input and an output and including a Schottky diode detector; and (b) means for coupling a portion of the input signal fed to the input port of the attenuator to the input of the detector circuit.

Claim 9

The frequency multiplier as recited in claim 7 wherein the means for providing a reference signal comprises: (a) a temperature transducer having a first terminal and a second terminal; (b) a first resistor having a first terminal and a second terminal, the first terminal of the first resistor connected to the first terminal of the temperature transducer and a voltage source and the second terminal of the first resistor connected to the second terminal of the temperature transducer; and (c) a second resistor having a first terminal and a second terminal, the first terminal of the second resistor connected to the second terminals of the temperature transducer and the resistor t provide the reference signal thereat and the second terminal of the second resistor connected to a voltage source return.

Claim 10

The frequency multiplier as recited in claim 8 wherein the means for providing the control signal to the control port comprises an operational amplifier.

Claim 11

A frequency multiplier comprising; (a) multiplying means, having an input and an output, for providing an output signal at the output, the output signal having a frequency of an even multiple of a frequency of a signal fed to the input thereof; and (b) an amplifier circuit comprising: (i) a first amplifier having an input and an output, the input coupled to the output of the multiplier means; (ii) an attenuator, having an input port, an output port and a control port, the input port fed by the output of the first amplifier; (iii) means for providing an intermediate control signal in response to variations in an output signal fed from the output of the first amplifier; (iv) means for providing a reference signal, the reference signal indicative of ambient temperature of the amplifier circuit; and (v) means, fed by the reference signal and the intermediate control signal, for providing a control signal to the control port for minimizing variations of signal level in an output signal at the output port of the attentuator.

Claim 12

A frequency multiplier comprising; (a) multiplying means, having an input and an output, for providing an output signal at the output, the output signal having a frequency of an even multiple of a frequency of a signal fed to the input thereof; and (b) an amplifier circuit comprising: (i) a first amplifier having an input and an output, the input coupled to the output of the multiplier means; (ii) an attenuator, having an input port, an output port and a control port, the input port fed by the output of the first amplifier; (iii) means for providing an intermediate control signal in response to variations in an output signal fed from the output of the first amplifier; (iv) means for providing a reference signal, the reference signal indicative of ambient temperature of the amplifier circuit; and (v) means, fed by the reference signal and the intermediate control signal, for providing a control signal to the control port for minimizing variations of signal level in an output signal at the output port of the attentuator.

Claim 13

The frequency multiplier as recited in claim 10 wherein the multiplier means comprises: (a) a first quadrature hybrid having a first port as an input port and a second and a third port as output ports, the first port being the input of the multiplier means; (b) a second quadrature hybrid having a first and a fourth port as input ports and a second and a third port as output ports, the first port of the second quadrature hybrid coupled to the second por of the first quadrature hybrid and the fourth port of the second quadrature hybrid coupled to the third port of the first quadrature hybrid, the second port of the second quadrature hybrid being the output of the multiplier means; (c) a first and a second diode, each diode having an anode and a cathode, the cathode of the first diode connected to the cathode of the second diode and to ground, the anode of the first diode connected to a junction between the second por of the first quadrature hybrid and the first port of the second quadrature hybrid and the anode of the second diode connected to a junction between the third port of the first quadrature hybrid and the fourth port of the second quadrature hybrid.

Claim 14

The frequency multiplier as recited in claim 11 wherein the first quadrature hybrid comprises a fourth port, the frequency multiplier further comprising a first and a second resistor, the first resistor disposed between the fourth port of the first quadrature hybrid and ground and the second resistor disposed between the third port of the second quadrature hybrid and ground.

Claim 15

The frequency multiplier as recited in claim 12 further comprising a highpass filter having an input and an output with the input of the highpass filter connected to the output of the multiplier means and the output of the highpass filter connected to the input of the amplifier circuit.

Claim 16

The frequency multiplier as recited in claim 13 further comprising an input amplifier having an input and an output, the output of the input amplifier coupled to the input of the multiplier means.

Claim 17

The frequency multiplier as recited in claim 14 further comprising a matching network having an input and an output, the input of the matching network connected to the output of the input amplifier and the output of the matching network connected to the input of the multiplier means.

Claim 18

The frequency multiplier as recited in claim 15 further comprising a second amplifier having an input and an output, the input of the amplifier fed by the output port of the attentuator.

Claim 19

The frequency multiplier as recited in claim 16 wherein the means for providing an intermediate control signal comprises: (a) a detector circuit having an input and an output and including a Schottky diode detector; and (b) means for coupling a portion of the input signal fed to the input port of the attenuator to the input of the detector circuit.

Claim 20

The frequency multiplier as recited in claim 17 wherein the means for providing a reference signal (a) a temperature transducer having a first terminal and a second terminal; (b) a first resistor having a first terminal and a second terminal, the first terminal of the first resistor connected to the first terminal of the temperature transducer and a voltage source and the second terminal of the first resistor connected to the second terminal of the temperature transducer; and (c) a second resistor having a first terminal and a second terminal, the first terminal of the second resistor connected to the second terminals of the temperature transducer and the resistor to provide the reference signal thereat and the second terminal of the second resistor connected to a voltage source return.

Claim 21

The frequency multiplier as recited in claim 18 wherein the means for providing the control signal to the control port comprises an operational amplifier.