Stabilized frequency and phase locked loop with saw devices on common substrate

Claim 2

A television signal receiver comprising: tuning means for converting a received RF signal to an IF signal of substantially 45 MHz; IF SAW bandpass filter means, having a predetermined frequency response characteristic, for processing said IF signal; means including oscillator means and a SAW resonator for generating a reference signal, said oscillator means having an output that is an even integer multiple of the IF signal frequency, and including dividing means for producing said IF signal frequency from said output; means for synchronously demodulating said IF signal responsive to said reference signal and developing a control signal for application to said tuning means for locking said IF signal to said reference signal; and said IF SAW bandpass filter means and said SAW resonator being fabricated on a common substrate whereby the frequency of said IF signal tracks variations in said predetermined frequency response characteristic.

Claim 3

A television receiver comprising tuner means for converting a received RF signal to an IF signal of substantially 45 Mhz; a SAW bandpass filter having a predetermined frequency response characteristic for processing said IF signal; oscillator means, including a SAW resonator, for developing a reference signal; frequency and phase locked loop means coupled to said oscillating means and to said SAW bandpass filter for developing a control voltage for said tuning means; synchronous demodulator means coupled to said SAW bandpass filter and to said oscillator means for developing a baseband video signal from said IF signal; and said SAW bandpass filter and said SAW resonator being formed on the same lithium niobate substrate and further including; means for minimizing crosstalk between said SAW bandpass filter and said SAW resonator, said crosstalk minimizing means comprises a pattern of ink on said substrate individually surrounding said SAW bandpass filter and aid SAW resonator, whereby changes in temperature and frequency of said SAW bandpass filter or said SAW resonator have minimal effect on their tracking.

Claim 4

A television receiver comprising tuner means for converting a received RF signal to an IF signal of substantially 45 Mhz; a SAW bandpass filter having a predetermined frequency response characteristic for processing said IF signal; oscillator means, including a SAW resonator, for developing a reference signal; frequency and phase locked loop means coupled to said oscillating means and to said SAW bandpass filter for developing a control voltage for said tuning means; synchronous demodulator means coupled to said SAW bandpass filter and to said oscillator means for developing a baseband video signal from said IF signal; and said SAW bandpass filter and said SAW resonator being formed on the same lithium niobate substrate and further including; means for minimizing crosstalk between said SAW bandpass filter and said SAW resonator, said crosstalk minimizing means comprises a pattern of ink on said substrate individually surrounding said SAW bandpass filter and aid SAW resonator, whereby changes in temperature and frequency of said SAW bandpass filter or said SAW resonator have minimal effect on their tracking.

Claim 5

A television signal receiver comprising: tuning means for converting a received RF signal to an IF signal of substantially 45 MHz; IF SAW bandpass filter means, having a predetermined frequency response characteristic, for processing said IF signal; means including oscillator means and a SAW resonator for generating a reference signal; means for synchronously demodulating said IF signal responsive to said reference signal and developing a control signal for application to said tuning means for locking said IF signal to said reference signal; said IF SAW bandpass filter means and said SAW resonator being fabricated on a common lithium niobate substrate whereby the frequency of said IF signal tracks variations in said predetermined frequency response characteristic; and crosstalk minimizing means comprising a pattern of ink on said common substrate individually surrounding said SAW devices.

Claim 6

A television signal receiver comprising: tuning means for converting a received RF signal to an IF signal of substantially 45 MHz; IF SAW bandpass filter means, having a predetermined frequency response characteristic, for processing said IF signal; means including oscillator means and a SAW resonator for generating a reference signal; means for synchronously demodulating said IF signal responsive to said reference signal and developing a control signal for application to said tuning means for locking said IF signal to said reference signal; said IF SAW bandpass filter means and said SAW resonator being fabricated on a common lithium niobate substrate whereby the frequency of said IF signal tracks variations in said predetermined frequency response characteristic; and crosstalk minimizing means comprising a pattern of ink on said common substrate individually surrounding said SAW devices.