Abstract: A clamping circuit with a low-pass filter inserted in a feedback loop from an output terminal of a comparator to variable current sources for obtaining a feedback signal having only a DC component or having only a substantial portion of a DC component obtained by removing an AC component due to a burst signal from the output signal of the comparator.

Abstract: A cassette-based recording/reproducing apparatus comprises a cassette holder 2 which is provided in a base 4 and is moved in the base between a first position and a second position while holding a cassette 1 therein. A resilient engagement member 6 is mounted to the cassette holder 2 and engages the cassette 1 to hold the cassette 1 in the cassette holder 2. A disengaging member 10 is mounted to the base 4 and engages the resilient engagement member 6 for causing the resilient engagement member 6 to resiliently deflect to move out of engagement with the cassette 1 when the cassette holder 2 is at the first position, and disengages from the resilient engagement member 6 for allowing the resilient engagement member 6 to move out of engagement with the disengaging member 10 to subsequently engage the cassette 1 to securely urge the cassette 1 against the cassette holder 2 when the cassette holder 2 is at the second position.

Abstract: Two or three trenches are formed in a silicon substrate, and a conductive layer is formed in the silicon substrate facing the trenches. An oxide film for insulation is formed on a surface of the conductive layer facing the trenches. The trenches are filled with polysilicon, and the conductive layer and the polysilicon constitute a capacitor through the oxide film. Since this capacitor has two or three trenches, an effective area sufficiently large for increasing a capacitance value of the capacitor can be obtained without increasing the plane area of the device. The conductive layer and the polysilicon are connected to aluminum interconnection layers through a silicide layer, so as to be connected to other integrated circuits.