Patent ID: 7768358

Claim:
Oscillatory signal output circuitry comprising: an amplifier amplifying an oscillating signal of an oscillatory circuit; a first node receiving the amplified oscillating signal; a first capacitor connected between said first node and a second node; a second capacitor connected between said first node and a third node; a first bias voltage generator connected to said second node and providing said second node with a first bias voltage; a second bias voltage generator connected to said third node and providing said third node with a second bias voltage; and an output signal generator connected to said second node, said third node and an output node, and developing a signal on said output node in response to a signal appearing on said second node and said third node, wherein said first bias voltage generator comprises a first P-type field effect transistor and a first constant current source, wherein said first constant-current source is an N-type field effect transistor, and said second bias voltage generator comprises a first N-type field effect transistor and a second constant-current source, wherein said second constant-current source is an P-type field effect transistor, and wherein said output signal generator comprises a second P-type field effect transistor having a gate electrode directly connected to a gate electrode and a drain electrode of said first P-type field effect transistor, and a second N-type field effect transistor having a gate electrode directly connected to a gate electrode and a drain electrode of said first N-type field effect transistor.