Quadrature demodulator having active filters formed with emitter follower output stages
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United States of America Patent
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Mar 31, 1998
Grant Date -
N/A
app pub date -
Nov 15, 1996
filing date -
Nov 17, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides a quadrature demodulator which removes unnecessary higher harmonic signals included in a demodulation output without giving rise to increase in number of externally connected parts and increase in current consumption. The quadrature demodulator includes a first double differential circuit to which a modulated signal and a first local signal are inputted, a first emitter follower circuit for effecting impedance conversion, a second double differential circuit to which the modulated signal and a second local signal having a phase shifted by 90-degrees from the first local signal are inputted, and a second emitter follower circuit connected to a pair of outputs of the second double differential circuit for effecting impedance conversion. The quadrature demodulator further includes a CR circuit including a resistor and a capacitor connected to each of the outputs of the first and second double differential circuits such that an active filter is formed from the CR circuit and a corresponding one of the first and second emitter follower circuits.
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