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US 7,459,981 B2Granted
Circuits and methods for implementing transformer-coupled amplifiers at millimeter wave frequencies
AssigneeInternational Business Machines Corporation
InventorsBrian A. Floyd, David Goren, Ullrich R. Pfeiffer, Scott Kevin Reynolds
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Abstract
Circuits and methods are provided for building integrated transformer-coupled amplifiers with on-chip transformers that are designed to resonate or otherwise tune parasitic capacitances to achieve frequency tuning of amplifiers at millimeter wave operating frequencies.
Claims1
An integrated amplifier circuit, comprising:
- a differential amplifier stage having a node with a parasitic capacitance and having differential output terminals;
- an integrated transformer device connected to the node of the differential amplifier stage, wherein the integrated transformer device is structured to provide a parasitic inductance for tuning the parasitic capacitance at an operating frequency of the integrated amplifier circuit, wherein the integrated transformer device comprises a 1:1 coupled-wire transformer with primary and secondary conductors stacked over a slotted ground plane, wherein the parasitic inductance of the integrated transformer device is set by a length of the primary and secondary conductors, wherein the primary conductor connected is disposed between the differential output terminals of the differential amplifier stage;
- a supply voltage feed connected to the primary conductor of the integrated transformer device;
- and
- an impedance matching network connected to an output of the integrated transformer device.
2 more elements
Dependencies are inferred from the claim text.