Albert J Crowley Deceased12118 Aster Rd, Philadelphia, PA 19154

4156855, May 29, 1979

Jan 26, 1978

5/872563

Albert T. Crowley - Somerdale NJ

RCA Corporation - New York NY

H03B 304

331 1A

A phase locked loop includes a voltage-controlled oscillator, and a phase and frequency detector for comprising an input signal pulse wave with a pulse wave from the voltage-controlled oscillator, and for providing a frequency control voltage to the voltage-controlled oscillator. When the pulses overlap, a pulse comparison circuit in the phase and frequency detector produces a frequency "up" signal or a frequency "down" signal proportional to the correction necessary. When the pulses do not overlap, the pulse comparison circuit produces a "non-overlap" signal which effects a rapid frequency correction by causing a current pump in the phase and frequency detector to increase its output to a fixed maximum value, and by causing a loop filter to increase its bandwidth to a fixed maximum value.

4468632, Aug 28, 1984

Nov 30, 1981

6/326152

Albert T. Crowley - Somerdale NJ

RCA Corporation - New York NY

H03L 718

331 14

An improvement in a frequency synthesizer comprising a voltage-controlled oscillator (VCO) for generating an output signal S. sub. VCO of frequency F. sub. VCO, a divider for dividing F. sub. VCO in division cycles with each division cycle consisting of the division of F. sub. VCO by N, Y times, and by (N+M), Z times, in an iterative manner to produce a divided output signal S. sub. N of frequency F. sub. N, where the division ratio is ##EQU1## and where N, Y, M and Z are integers, a reference signal generator for generating a reference signal S. sub. R of frequency F. sub. R, and a phase detector responsive to S. sub. N and S. sub. R to produce an output signal whose amplitude is representative of the phase therebetween. The improvement is a control circuit comprising logic for detecting and averaging the output signal from the phase detector during each division of F. sub. VCO in each division cycle to produce a d. c.

4528523, Jul 9, 1985

Dec 20, 1982

6/451423

Albert T. Crowley - Somerdale NJ

RCA Corporation - Princeton NJ

H03L 706

331 10

An improved circuit for rapidly locking the phase of a reference signal e. sub. r of frequency f. sub. r with the phase of a signal e. sub. VCO in a phase locked loop which comprises a voltage controlled oscillator (VCO) for generating the signal e. sub. VCO of frequency f. sub. VCO, a divide-by-N circuit, for dividing f. sub. VCO by a variable N, a frequency/phase detector responsive to the phases of e. sub. VCO and e. sub. r to supply a control signal e. sub. c to the VCO, a loop filter circuit comprising a resistor and a capacitor for filtering e. sub. c, and logic for changing N to a new value N' in a time interval not less than T. Also provided is a circuit responsive to each change of N for coarse tuning the control signal supplied to the VCO and comprising a voltage generator responsive to each new value N' of N for generating a coarse tuned voltage having a magnitude which, when applied across the capacitor, will change the frequency f. sub. VCO /N to f. sub. VCO /N' to approximate f. sub. r.

4105947, Aug 8, 1978

Sep 16, 1977

5/833750

Albert T. Crowley - Somerdale NJ

RCA Corporation - New York NY

H03B 304

331 1A

A phase and frequency detector includes a first flip-flop triggered by a pulse wave from a reference source, and a second flip-flop triggered by a pulse wave from a voltage-controlled oscillator. Gate means couple outputs of the flip-flops back to reset inputs of the flip-flops so that one of the flip-flops generates pulses having widths proportional to the phase difference of the first and second pulse waves. The gate means inhibits the resetting of the triggered flip-flop when the pulses of the first and second pulse waves do not overlap, so that the triggered flip-flop then generates a continuous output useful for rapidly correcting the frequency of the voltage-controlled oscillator.

4349887, Sep 14, 1982

Aug 22, 1980

6/181086

Albert T. Crowley - Somerdale NJ

RCA Corporation - New York NY

H03B 1900

364703

A digitally controlled oscillator for generating a plurality of signals spaced apart by very small frequency increments. The system comprises first means for generating a source signal of frequency f. sub. c, second means responsive to said first signal to produce a first binary output signal of frequency Nf. sub. c /2. sup. n, where n is a variable integer. Also provided are first frequency divider means responsive to said first binary output signal to produce a second binary output signal of frequency Nf. sub. c /2. sup. n+m, where m is another integer and second frequency divider means also responsive to said first signal f. sub. c to produce a third binary output signal of frequency f. sub. c /2. sup. T. Further provided are logic means responsive to said second and third binary output signals to produce a fourth binary output signal of average frequency f. sub. c /2. sup. T +Nf. sub. c /2. sup. n+m.

4516084, May 7, 1985

Feb 18, 1983

6/467644

Albert T. Crowley - Somerdale NJ

RCA Corporation - Princeton NJ

H03L 700

331 2

A frequency synthesizer for controlling the frequency f. sub. 0 of a signal e. sub. 0 in response to a control signal e. sub. c2 to produce a band of selectable frequencies separated by. DELTA. f between the frequencies f. sub. x and f. sub. y, where (f. sub. x +R. DELTA. f)=f. sub. 0 and R is zero or any integer. ltoreq. (f. sub. y -f. sub. x)/. DELTA. f. The invention includes a first generator for generating the signal e. sub. 0, a second generator for generating a signal e. sub. 1 having a band of selectable frequencies separated by. delta. f, where. delta. f>>. DELTA. f, a frequency subtractor for subtracting f. sub. 1 from f. sub. 0 to produce a signal e. sub. 2 of frequency f. sub. 2. Also provided is a third generator for generating a variable preliminary reference signal of frequency f. sub. pr consisting of a band of selectable frequencies separated by M. DELTA.

4459559, Jul 10, 1984

Nov 30, 1981

6/326141

Albert T. Crowley - Somerdale NJ

RCA Corporation - New York NY

H03D 1300
H03L 718

331 1A

An improvement in a phase locked loop comprising a VCO for generating a signal S. sub. VCO of frequency f. sub. VCO, a divider for dividing f. sub. VCO to produce a signal S. sub. N of frequency f. sub. N, a reference signal generator for generating a reference signal S. sub. R of frequency f. sub. R, and with said VCO responsive to a particular value E. sub. c of a variable control signal e. sub. c to cause f. sub. N =f. sub. R for a given value of N, the improvement consisting of a phase/frequency detector for detecting and correcting frequency and phase differences between S. sub. N and S. sub. R to cause f. sub. N =f. sub. R and comprising a three stage left/right shift register responsive to one of signals S. sub. N or S. sub. R to shift binary O's into the first stage thereof in the right direction and responsive to the other of signals S. sub. N or S. sub. R to shift binary 1's into the third stage thereof in the left direction.

4464638, Aug 7, 1984

Nov 30, 1981

6/326136

Albert T. Crowley - Somerdale NJ
Robert M. Lisowski - Cherry Hill NJ

RCA Corporation - New York NY

H03L 718

331 1A

An improvement in a digital frequency synthesizer comprising a voltage-controlled oscillator (VCO) for producing a signal S. sub. VCO having a frequency f. sub. VCO, a first signal generator for generating a plurality of signals S. sub. AS having a spectrum of frequencies f. sub. AS, all exceeding a given minimum frequency f. sub. M, a mixer responsive to S. sub. VCO and to S. sub. AS to produce an output signal having a frequency (f. sub. VCO. +-. f. sub. AS), a divide-by-N divider responsive to (f. sub. VCO. +-. f. sub. AS) to produce a signal S. sub. N having a frequency f. sub. N, a second signal generator for generating a first reference signal S. sub. R1 having a frequency f. sub. R1, a phase detector responsive to S. sub. N and S. sub. R1 to produce a d. c.