Abstract: A terrestrial broadcast tuner section is disposed in an area A1, and frequency-converts an externally supplied terrestrial broadcast signal into an IF signal. A terrestrial broadcast analog demodulation section is disposed in an area A3, and demodulates the IF signal frequency-converted by the terrestrial broadcast tuner section. A satellite broadcast tuner section is disposed in an area A2, and frequency-converts an externally supplied satellite broadcast signal into a signal having a frequency band lower than that of the satellite broadcast signal. A digital demodulation section is disposed in an area A4, and demodulates the signal supplied from either one of the terrestrial broadcast tuner section and the satellite broadcast tuner section. With this arrangement, a broadcast receiving apparatus easily changeable from the one for analog and digital broadcasting to the one for digital broadcasting only can be provided.

Abstract: In one embodiment of a printed circuit board securing structure and a tuner unit according to the present invention, a chassis comprises a chassis frame that surrounds the lateral faces of a printed circuit board and a shield plate that partitions the space within the chassis frame, and circuit board holding parts for holding the printed circuit board between the circuit board holding parts and the shield plate are disposed on inner wall faces of the chassis frame. The circuit board holding parts are configured to be able to secure the printed circuit board from both faces.

Abstract: A terrestrial broadcast tuner section is disposed in an area A1, and frequency-converts an externally supplied terrestrial broadcast signal into an IF signal. A terrestrial broadcast analog demodulation section is disposed in an area A3, and demodulates the IF signal frequency-converted by the terrestrial broadcast tuner section. A satellite broadcast tuner section is disposed in an area A2, and frequency-converts an externally supplied satellite broadcast signal into a signal having a frequency band lower than that of the satellite broadcast signal. A digital demodulation section is disposed in an area A4, and demodulates the signal supplied from either one of the terrestrial broadcast tuner section and the satellite broadcast tuner section. With this arrangement, a broadcast receiving apparatus easily changeable from the one for analog and digital broadcasting to the one for digital broadcasting only can be provided.

Abstract: An integrated circuit includes a first-stage amplifier circuit and a following-stage amplifier circuit connected in series, a common power source pad for supplying power to the amplifier circuits, and metal wires respectively connecting the common power source pad to the amplifier circuits. On the metal wire which connects the first-stage amplifier and the power source pad, an integrator is electrically connected. This arrangement decreases a coupling noise generated in the first-stage amplifier circuit, thereby stabilizing circuit operation of the following-stage amplifier circuit.

Abstract: An integrated circuit includes a first-stage amplifier circuit and a following-stage amplifier circuit connected in series, a common power source pad for supplying power to the amplifier circuits, and metal wires respectively connecting the common power source pad to the amplifier circuits. On the metal wire which connects the first-stage amplifier and the power source pad, an integrator is electrically connected. This arrangement decreases a coupling noise generated in the first-stage amplifier circuit, thereby stabilizing circuit operation of the following-stage amplifier circuit.

Abstract: An photoreceptive amplifier circuit includes a first differential amplifier having two input resistors, two input voltage dividing resistors, two feedback resistors, for providing temperature characteristic of sensitivity=0 of a photodiode with respect to light having wavelength of 650 nm, and a second differential amplifier having two input resistors, two input voltage dividing resistors, two feedback resistors for providing temperature characteristic of sensitivity=0 of a photodiode with respect to light having wavelength of 780 nm. One of outputs from these differential amplifiers is selected depending on the wavelength. Therefore, it is possible to cancel changes of the temperature characteristic due to variation of wavelength by the temperature characteristic of the sensitivity of the photoreceptive amplifier circuit so that the temperature characteristic of the whole optical pickup element becomes 0.