公开(公告)号：US3757132A

公开(公告)日：1973-09-04

申请号：US3757132D

申请日：1972-03-24

Applicant: ERICSSON TELEFON AB L M

Inventor： NILSSON L

IPC: H03K5/153 ,  H04Q1/44 ,  H04L15/24

CPC classification number: H04Q1/44 ,  H03K5/153

Abstract: The invention refers to an apparatus for the detection of rectangular pulses in which the duration of the leading edge and the trailing edge respectively is constant whereas the peak amplitude can fluctuate. The apparatus includes a comparison circuit that compares the instantaneous amplitude of the rectangular pulses with the amplitude of a reference voltage and which upon equality between the levels of the amplitudes being compared delivers an indicating pulse. According to the invention, the reference voltage is, during the leading edges formed by the output voltage from a differentiating circuit which is fed with the rectangular pulses and which during each of their leading edges delivers an output voltage the time function of which has such a predetermined intersection point with the time function of the leading edge that the amplitude value at the intersection point equals a selected fraction of the peak amplitude of the rectangular pulse.

公开(公告)号：US3708762A

公开(公告)日：1973-01-02

申请号：US3708762D

申请日：1971-04-29

Applicant: ERICSSON TELEFON AB L M

Inventor： NILSSON L

IPC: H03B1/00 ,  H03B5/24

CPC classification number: H03B5/24 ,  H03B2200/0066 ,  H03B2201/02

Abstract: An electric oscillator includes a source of electrical energy coupled to a frequency determining network. The network includes first and second branches connected in parallel wherein the first branch comprises a capacitor and the second branch comprises a variable resistor connected to one end of each of two fixed resistors whose other ends are interconnected by a further capacitor.

Abstract translation: 电振荡器包括耦合到频率确定网络的电能源。 网络包括并联连接的第一和第二分支，其中第一分支包括电容器，并且第二分支包括连接到两个固定电阻器中的每一个的可变电阻器，其另一端通过另外的电容器互连。