Low noise voltage controlled oscillator

Patent metadata

Field	Value
Publication number	US-9035708-B2
Application number	US-201313916612-A
Country	US
Kind code	B2
Filing date	Jun 13, 2013
Priority date	Jun 13, 2013
Publication date	May 19, 2015
Grant date	May 19, 2015

Abstract

An enhanced negative resistance voltage controlled oscillator (VCO) circuit is provided, in which a parallel connection of a capacitor and a resistor configured to provide frequency-dependent transconductance is present across source nodes of a first pair of field effect transistors in which gate nodes and drain nodes are cross-coupled. The source nodes of the first pair of field effect transistors are electrically shorted to drain nodes of a second pair of field effect transistors of which the gate nodes are electrically shorted to the gate nodes of the first pair of field effect transistors. The parallel connection of the capacitor and the resistor includes a parallel connection of a capacitor and a resistor such that the net transconductance of the first pair of field effect transistors is less at low frequencies where thermal noise and flicker noise are dominant part of the phase noise than at the operational frequency range.

First claim

What is claimed is:

1. A voltage controlled oscillator (VCO) circuit comprising:
a first transistor and a second transistor, wherein a gate of said first transistor is electrically shorted to a drain of said second transistor, and a gate of said second transistor is electrically shorted to a drain of said first transistor;
at least one inductor electrically shorted to said drain of said first transistor at one end and electrically shorted to said drain of said second field trans…

Assignees

• IBM

Inventors

• Sun Pinping

Classifications

• H03B5/24 Primary

  Electricity · mapped topic

• H03B5/1228 Primary

  Electricity · mapped topic

• H03B2200/009

  Electricity · mapped topic

• H03B2200/0082

  Electricity · mapped topic

• H03B5/1243

  Electricity · mapped topic