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US 6,665,527 B2Granted
Double balanced mixer circuit
AssigneeMotorola, Inc.
InventorThomas E. Schiltz
Life of this patent
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AssigneeMotorola, Inc.
InventorThomas E. Schiltz
Estimating the term…
A double balanced mixer circuit 10 receives an input signal (RFIN) at first input terminals (14), supplying that signal to the primary side of a transformer (12). The secondary side of the transformer (12) is coupled to the bases of transistors (18 and 26) that supply the tail currents to a pair of differential transistors. The center tap of transformer (12) receives a voltage (VBIAS) that keeps the transistors (18 and 26) biased in their linear regions. A capacitor (16) provides an AC ground at the center tap point of the transformer (12). The first differential transistor pair (20 and 22) and the second differential transistor pair (28 and 30) receive a differential signal (LO) at second input terminals 15. A differential signal IFOUT down-converted in frequency from the RF frequency range to the IF frequency range is supplied at output terminals (34).
An integrated double balanced mixer having first and second differential transistor pairs, the first differential transistor pair including first and second transistors with commonly connected first conducting terminals and the second differential transistor pair including third and fourth transistors with commonly connected first conducting terminals, the integrated double balanced mixer comprising:
An integrated mixer circuit, comprising:
Dependencies are inferred from the claim text.