公开(公告)号：US3596184A

公开(公告)日：1971-07-27

申请号：US3596184D

申请日：1969-08-15

Applicant: MOTOROLA INC

Inventor： HANUS GEORGE M ,  LUCAS ALFRED R

IPC: H03G3/34 ,  H04B1/10

CPC classification number: H03G3/344

Abstract: An integrated circuit includes, on a single chip, a noisedetection circuit and a squelch filter circuit having a short time constant ripple filter and a long time constant ripple filter. The noise detector includes a differential feedback amplifier with external circuitry for controlling the gain and frequency shaping of the amplifier in a feedback circuit. A highimpedance cascaded emitter-follower circuit of opposite conductivity transistors couples the noise detector to the ripple filters, with the long time constant ripple filter being responsive to signals just above the squelch threshold in order to provide maximum sensitivity and smooth operation. At strong signal levels, where such a long time constant ripple filter is not necessary, the circuit is switched to a short time constant filter by a signal level detection circuit. If the signal drops to a low signal level relatively slowly, the circuit switches back to the long time constant filter; but if the signal drops rapidly, as for example, where the transmitter ceases transmission, only the short time constant filter is operative and the turnoff of the squelch circuit is very rapid, thereby eliminating the noise burst or ''''squelch tail.

公开(公告)号：US3355709A

公开(公告)日：1967-11-28

申请号：US42559365

申请日：1965-01-14

Applicant: MOTOROLA INC

Inventor： HANUS GEORGE M

IPC: F01L1/18 ,  H04W88/02

CPC classification number: H04W88/027 ,  F01L1/183

公开(公告)号：US3641441A

公开(公告)日：1972-02-08

申请号：US3641441D

申请日：1969-11-13

Applicant: MOTOROLA INC

Inventor： GUNN DAVID L ,  HANUS GEORGE M

IPC: H03D7/12 ,  H04B1/26

CPC classification number: H03D7/12

Abstract: A frequency conversion circuit for a frequency-modulated receiver adapted to be manufactured in integrated circuit form. The circuit includes an oscillator of the Colpitts type, a mixer arranged in an emitter follower configuration, and input and output amplifiers. A feedback circuit coupled between the input amplifier and mixer allows operation of the circuit over a substantial voltage range. Arrangement of the mixer in an emitter follower configuration results in reduced levels of undesired frequencies. The gain of the input and output amplifiers may be varied allowing usage in different products.

Abstract translation: 一种适用于以集成电路形式制造的频率调制接收机的频率转换电路。 该电路包括Colpitts类型的振荡器，以射极跟随器配置布置的混频器以及输入和输出放大器。 耦合在输入放大器和混频器之间的反馈电路允许电路在相当大的电压范围内运行。 混频器在射极跟随器配置中的排列导致不希望的频率的降低。 可以改变输入和输出放大器的增益，允许在不同产品中使用。

公开(公告)号：US3622900A

公开(公告)日：1971-11-23

申请号：US3622900D

申请日：1969-09-29

Applicant: MOTOROLA INC

Inventor： HANUS GEORGE M ,  LUCAS ALFRED R ,  SKUTTA FRANK R

IPC: H03F1/26 ,  H03F3/187 ,  H03G3/34 ,  H03F3/68

CPC classification number: H03F3/187 ,  H03F1/26 ,  H03G3/344

Abstract: Direct coupled transistorized operational amplifier including differential amplifier input circuit, Darlington connected transistor driver, and high-efficiency output stage. To turn the amplifier on and off, bias potentials are applied to the differential amplifier in a manner to prevent audio transients. A control circuit controls the charging of capacitors to provide the bias potentials. The amplifier is constructed in integrated circuit form with compensation for temperature and frequency characteristics of substrate PNP and ring collector lateral PNPtransistors, and for input to output phase shift through the amplifier.

公开(公告)号：US3617888A

公开(公告)日：1971-11-02

申请号：US3617888D

申请日：1969-08-07

Applicant: MOTOROLA INC

Inventor： HANUS GEORGE M ,  LUCAS ALFRED R ,  SKUTTA FRANK R

IPC: H04W88/02 ,  H04B1/48

CPC classification number: H04W88/027 ,  Y02D70/00

Abstract: A tone signal encoder-decoder circuit uses an amplifier and a single tuned circuit for decoding and encoding a tone signal. A switching network enables a feedback circuit to cause operation of the circuit as an encoder and disables the feedback circuit to cause operation as a decoder. The DC operating levels for the circuit are increased and the source of operating potential for the frequency-responsive unit of the circuit operates through a higher impedance in the encoder mode. A provision also is made for facilitating rapid start for the encoding oscillator unit. Switching from the decoder to the encoder mode also disables the decoder mode preamplifier circuit and changes the biasing level of the detector to increase the threshold thereof when the circuit is in the encode mode of operation. A final provision is made for causing the radio receiver with which the circuit is employed to have the audio portion thereof selectively controlled by the output of the detector in the encoder-decoder circuit or the output of the normal receiver squelch circuit or a combination of the outputs of the squelch circuit and the detector at the option of the operator of the receiver.

公开(公告)号：CA911548A

公开(公告)日：1972-10-03

申请号：CA911548D

Applicant: MOTOROLA INC

Inventor： SKUTTA FRANK R ,  HANUS GEORGE M ,  LUCAS ALFRED R

IPC: H03F1/26 ,  H03F3/187 ,  H03F3/68 ,  H03G3/34

公开(公告)号：CA916241A

公开(公告)日：1972-12-05

申请号：CA916241D

Applicant: MOTOROLA INC

Inventor： SKUTTA FRANK R ,  HANUS GEORGE M ,  LUCAS ALFRED R

IPC: H04B1/48 ,  H04Q7/16

公开(公告)号：CA941456A

公开(公告)日：1974-02-05

申请号：CA96159

申请日：1970-10-21

Applicant: MOTOROLA INC

Inventor： GUNN DAVID L ,  HANUS GEORGE M

IPC: H03D7/12

Abstract: A frequency conversion circuit for a frequency-modulated receiver adapted to be manufactured in integrated circuit form. The circuit includes an oscillator of the Colpitts type, a mixer arranged in an emitter follower configuration, and input and output amplifiers. A feedback circuit coupled between the input amplifier and mixer allows operation of the circuit over a substantial voltage range. Arrangement of the mixer in an emitter follower configuration results in reduced levels of undesired frequencies. The gain of the input and output amplifiers may be varied allowing usage in different products.