Voltage controlled oscillator

US8957738B1 · kind B1 · utility

Assignee

• HITTITE MICROWAVE LLC · US

Inventors

• Michael Koechlin · Chelmsford, US
• John A. Chiesa · Pelham, US
• Christopher O'Neill · Chelmsford, US
• Ekrem Oran · Nashua, US
• John N. Poelker · Simi Valley, US
• Cemin Zhang · Chino, US

Key dates

• Filing date: Oct 18, 2012
• Grant date: Feb 17, 2015
• Expiry date: Jan 30, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03B2201/0208
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A voltage controlled oscillator including an RF output terminal and a DC control terminal, an active circuit, and a resonant circuit interconnected with the active circuit and including a plurality of series resonators each having an electrically variable capacitance and fixed inductor; the active circuit includes at least one transistor having an operating current density which is approximately 35% or less of the peak fT operating current density and/or the active circuit includes a multi-transistor bank disposed in at least two separate sections, each pair of sections spaced apart to provide improved thermal uniformity among the transistors without substantially increasing parasitic impedance among them for providing an improved lower phase noise output at said RF output terminal.