Narrowband LC folded cascode structure
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United States of America Patent
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Jul 25, 2000
Grant Date -
N/A
app pub date -
Sep 4, 1998
filing date -
Sep 4, 1998
priority date (Note) -
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Abstract
A low voltage cascode frequency conversion mixer circuit is provided. In place of a conventional current source, an LC tank circuit is used. This makes the circuit function as a mixer only over a narrow band of frequencies centred at the resonance frequency of the LC tank circuit. The circuit mixes an input signal with a local oscillator signal. Advantageously, a lower supply voltage may be used because a smaller DC drop exists across the tank circuit than does across conventional current sources. The circuit may also be used as an amplifier by connecting a DC bias voltage in place of the local oscillator.
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