Abstract: A capacitor has one end receiving an input signal and the other end outputting an output signal. A resistor circuit, connected between a power source and the other end of the capacitor, functions as a resistor. The resistor circuit includes a PNP transistor having a base connected to the other end of the capacitor and an NPN transistor having a base connected to the other end of the capacitor. A differential amplifier supplies complementary current to the PNP transistor and the NPN transistor. The differential amplifier receives, as negative feedback, the output signal from the other end of the differential amplifier.

Abstract: It is an object of the present invention to provide a circuit device in which a plurality of circuit elements including a circuit element having a hollow inside are sealed with resin, and to provide a method of manufacturing the same. A circuit device (10) has a first circuit element (13A) having a hollow inside and a plurality of second circuit elements (13B) electrically connected to the first circuit element (13A). The first and second circuit elements (13A) and (13B) are sealed with sealing resin (15). The distances by which the first circuit element (13A) is separated from the second circuit elements (13B) are longer than those by which the second circuit elements (13B) are separated from each other.

Abstract: An electronic equipment manufacturer has been bearing the burden to adjust variations in characteristics of semiconductor integrated circuits according to a conventional art. The device and the method of this invention include a microcomputer, signal processing circuit which processes an input signal accordingly to a control signal from the microcomputer and provides an output signal and a memory which stores adjustment values to adjust changes in signal characteristics due to variations in manufacturing of elements composing the signal processing unit. The microcomputer adjusts the changes in the signal characteristics of the signal processing circuit according to the adjustment values stored in the memory.

Abstract: An electronic equipment manufacturer has been bearing the burden to adjust variations in characteristics of semiconductor integrated circuits according to a conventional art. The device and the method of this invention include a microcomputer, signal processing circuit which processes an input signal accordingly to a control signal from the microcomputer and provides an output signal and a memory which stores adjustment values to adjust changes in signal characteristics due to variations in manufacturing of elements composing the signal processing unit. The microcomputer adjusts the changes in the signal characteristics of the signal processing circuit according to the adjustment values stored in the memory.

Abstract: A frequency of a first VCO (12) for generating a carrier of a video IF signal is set by using a frequency of a second VCO (15) as reference. The oscillation frequency of the second VCO (15) is controlled in response to the phase difference between an output signal of the first VCO (12) and the video IF signal. As a result, the output signal phase of the first VCO (12) is adjusted, and the output signal is locked to a carrier frequency of the video IF signal. Thus, the oscillation frequency of the first VCO (12) can be set automatically. Further, a signal for the phase difference between the output signal of the first VCO (12) and the video IF signal is also applied to the first VCO (12), thereby improving the stability of circuit operation.

Abstract: A television receiver includes a correction filter (10) having an inclination characteristic opposite to a slope of a video intermediate frequency signal. The video intermediate frequency signal correction by the correction filter is applied to a PLL circuit (11) and the PLL circuit generates a carrier signal of a video intermediate frequency locked to the video intermediate frequency signal. A synchronous detecting circuit (16) detects the video intermediate frequency signal before the correction in response to the signal output from the PLL circuit and outputs a video signal. At the same time, it generates a sound FM signal corresponding to a beat of the carrier signal of the video intermediate frequency and a carrier signal of a sound intermediate frequency. A sound detecting circuit (20) detects the sound FM signal and outputs a sound signal.

Abstract: A multi-channel sound signal received and detected in a TV receiver includes a main channel signal comprising a stereo sum (L+R) signal, a stereo pilot signal having a frequency of f.sub.H equal to the frequency of a horizontal synchronizing signal, and a sub-channel signal obtained by DSB modulation of a sub-carrier having a frequency of 2f.sub.H by a stereo difference (L-R) signal. In a TV multi-channel sound signal demodulator circuit, the sub-carrier is reproduced by a PLL circuit in response to the stereo pilot signal, to demodulate the stereo difference (L-R) signal using the sub-carrier. The stereo difference signal thus demodulated includes a 60Hz noise component due to interference between a sound signal and a video signal. However, the noise component is removed by a high-pass filter provided between a sub-channel signal demodulator circuit and a matrix circuit. Thus, right and left stereo signals R and L outputted from the matrix circuit do not include a noise component.