公开(公告)号：DE69030624D1

公开(公告)日：1997-06-05

申请号：DE69030624

申请日：1990-07-03

Applicant: MOTOROLA INC

Inventor： FISCH KENNETH ,  MITTEL JAMES ,  BROWN WINFIELD

IPC: G08B3/10 ,  H04Q7/00

公开(公告)号：DE69030726T2

公开(公告)日：1997-12-04

申请号：DE69030726

申请日：1990-01-05

Applicant: MOTOROLA INC

Inventor： GRANDFIELD WALTER ,  MITTEL JAMES ,  DAVIS WALTER

IPC: H03L7/00 ,  H03B5/04 ,  H03B5/12 ,  H03B5/36 ,  H03D7/00 ,  H03D7/12 ,  H04B1/16 ,  H04B1/26 ,  H04B1/10 ,  H04B15/06 ,  H03L5/00

Abstract: A heterodyne stage of a receiver which includes a conventional mixer circuit and local oscillator circuit further includes a differential amplifier circuit which measures the amplitude of the injection signal generated by the local oscillator circuit and controls it precisely to a desired reference level by adjusting the current bias supply to the local oscillator circuit within a banded range to ensure start-up of the local oscillator upon energization and to protect against loss of injection signal under all operating conditions. The differential amplifier circuit provides for a precise amplitude reference setting and sufficient closed-loop gain for controlling the amplitude of the injection signal with a minimum of error between the measured and reference values.

公开(公告)号：DE69030624T2

公开(公告)日：1997-11-06

申请号：DE69030624

申请日：1990-07-03

Applicant: MOTOROLA INC

Inventor： FISCH KENNETH ,  MITTEL JAMES ,  BROWN WINFIELD

IPC: G08B3/10 ,  H04Q7/00

公开(公告)号：DE69122115T2

公开(公告)日：1997-03-13

申请号：DE69122115

申请日：1991-09-30

Applicant: MOTOROLA INC

Inventor： MITTEL JAMES

IPC: G08B3/10 ,  H04B1/16 ,  G08B5/22 ,  H03D3/00 ,  H03G5/24

Abstract: A selective call receiver (100) includes a controlled oscillator (134) that generates an output signal (140) from a received signa. The controlled oscillator (134) has an input filter (136) that is controlled by a control signal (132) generated from a reference signal (122). The output signal (140) and the reference signal (122), generated from the received signal, are used to adjust the output of the controlled oscillator (134) to equal the reference signal (122). The control signal (132) controls a controlled filter (142) that filters a second signal (144).

公开(公告)号：DE69126317T2

公开(公告)日：1997-11-13

申请号：DE69126317

申请日：1991-10-07

Applicant: MOTOROLA INC

Inventor： MITTEL JAMES ,  DAVIS WALTER ,  FERNANDEZ SERGIO ,  PONCE DE LEON LORENZO ,  SIWIAK KAZIMIERZ

IPC: H04B1/16 ,  H03D7/16 ,  H03J1/00 ,  H04B1/14 ,  H04B5/04 ,  H03J7/06

Abstract: A receiver (200) includes an automatic frequency controller that determines the frequency of a receiver signal, and a calculates a frequency error from the received signal. The frequency error is used to calculate a correction factor (316) that is used to adjust the frequency of an oscillator (308) in response to the determined error.

公开(公告)号：DE69126317D1

公开(公告)日：1997-07-03

申请号：DE69126317

申请日：1991-10-07

Applicant: MOTOROLA INC

Inventor： MITTEL JAMES ,  DAVIS WALTER ,  FERNANDEZ SERGIO ,  PONCE DE LEON LORENZO ,  SIWIAK KAZIMIERZ

IPC: H04B1/16 ,  H03D7/16 ,  H03J1/00 ,  H04B1/14 ,  H04B5/04 ,  H03J7/06

Abstract: A receiver (200) includes an automatic frequency controller that determines the frequency of a receiver signal, and a calculates a frequency error from the received signal. The frequency error is used to calculate a correction factor (316) that is used to adjust the frequency of an oscillator (308) in response to the determined error.

公开(公告)号：DE69030726D1

公开(公告)日：1997-06-19

申请号：DE69030726

申请日：1990-01-05

Applicant: MOTOROLA INC

Inventor： GRANDFIELD WALTER ,  MITTEL JAMES ,  DAVIS WALTER

IPC: H03L7/00 ,  H03B5/04 ,  H03B5/12 ,  H03B5/36 ,  H03D7/00 ,  H03D7/12 ,  H04B1/16 ,  H04B1/26 ,  H04B1/10 ,  H04B15/06 ,  H03L5/00

Abstract: A heterodyne stage of a receiver which includes a conventional mixer circuit and local oscillator circuit further includes a differential amplifier circuit which measures the amplitude of the injection signal generated by the local oscillator circuit and controls it precisely to a desired reference level by adjusting the current bias supply to the local oscillator circuit within a banded range to ensure start-up of the local oscillator upon energization and to protect against loss of injection signal under all operating conditions. The differential amplifier circuit provides for a precise amplitude reference setting and sufficient closed-loop gain for controlling the amplitude of the injection signal with a minimum of error between the measured and reference values.

公开(公告)号：DE69122115D1

公开(公告)日：1996-10-17

申请号：DE69122115

申请日：1991-09-30

Applicant: MOTOROLA INC

Inventor： MITTEL JAMES

IPC: G08B3/10 ,  H04B1/16 ,  G08B5/22 ,  H03D3/00 ,  H03G5/24

Abstract: A selective call receiver (100) includes a controlled oscillator (134) that generates an output signal (140) from a received signa. The controlled oscillator (134) has an input filter (136) that is controlled by a control signal (132) generated from a reference signal (122). The output signal (140) and the reference signal (122), generated from the received signal, are used to adjust the output of the controlled oscillator (134) to equal the reference signal (122). The control signal (132) controls a controlled filter (142) that filters a second signal (144).