Patent ID: 11881817
Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An oscillator, comprising:
a first capacitor having a first terminal adapted to be coupled to a first node, and a second terminal coupled to ground;
a second capacitor having a first terminal adapted to be coupled to a second node, and a second terminal coupled to ground;
an inverter having an input coupled to said first node, and an output coupled to said second node;
a voltage shifting circuit coupled to said first node and to said second node and having an input for receiving a tuning signal, wherein said voltage shifting circuit changes an average voltage at said first node according to said tuning signal as a function of a value of a tunable capacitor when an oscillation occurs in response to a crystal being coupled between said first node and said second node; and
a hysteresis buffer, having an input coupled to one of said first node and said second node, and an output for providing a clock signal having a duty cycle responsive to said tuning signal.