Oscillation circuit and semiconductor device comprising that oscillation circuit
AssigneeNEC Electronics Corporation
InventorHidekazu Kawashima
Life of this patent
Estimating the term…
Abstract
An oscillation circuit used in a semiconductor device such as a cell-based IC, and comprises: an inverting amplifier, which is constructed so that it is possible connect a crystal oscillator XL between its input and output terminals, and so that it is possible to adjust its gain by a control signal CNT; and a wave-shaping circuit such as a Schmitt circuit that shapes the waveform of the oscillation signal output from the inverting amplifier. The wave-shaping circuit is constructed so that it is possible to adjust the gain when shaping a waveform according to a control signal CNT to correspond with the gain adjustment of the inverting amplifier.
Claims18
An oscillation circuit, comprising:
- an inverting amplifier that is constructed so that a solid oscillator can be connected between the input and output terminals thereof, and its gain can be adjusted externally;
- and
- a wave-shaping circuit that shapes the waveform of an oscillation signal that is output from the inverting amplifier to a digitized signal, wherein
- the wave-shaping circuit is constructed so that it is capable of adjusting rising and falling characteristics of the waveform to correspond with the gain adjustment by the inverting amplifier.
An oscillation circuit, comprising:
- an inverting amplifier that is constructed so that a solid oscillator can be connected between the input and output terminals thereof, and its gain can be adjusted externally;
- and
- a wave-shaping circuit that shapes the waveform of an oscillation signal that is output from the inverting amplifier to a digitized signal, wherein
- the wave-shaping circuit is constructed so that it is capable of adjusting the wave-shaping characteristics to correspond with the gain adjustment by the inverting amplifier,
- the wave-shaping circuit comprises a plurality of Schmitt circuits that can be selectively operated, and
- the plurality of Schmitt circuits have respectively different rising and falling characteristics.
An oscillation circuit comprising:
- an inverting amplifier;
- a wave-shaping circuit that shapes the waveform of an oscillation signal that is output from the inverting amplifier;
- and
- a selector coupled between the inverter amplifier and the wave-shaping circuit,
- wherein the wave-shaping circuit comprises a plurality of Schmitt circuits that have respectively different characteristics,
- wherein the selector outputs a signal from the inverter amplifier to one of the Schmitt circuits.
Dependencies are inferred from the claim text.