Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1984-08-27
1986-07-15
LaRoche, Eugene R.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
333178, 333174, 333186, H03H 703
Patent
active
046009035
ABSTRACT:
A bandpass filter is presented which is constructed so that bandwidth of the bandpass filter may be varied without varying gain from an input signal to an output signal when the input signal is at a center frequency. A crystal resonator is connected in series with a compensation resistance, and a variable resistance. Ignoring shunt capacitance, the crystal resonator may be modelled by a capacitance, an inductance and a loss resistance coupled in series. The compensation resistance is chosen so that the voltage drop across the compensation resistance is equal to the voltage drop across the loss resistance. A transformer having a primary coil, a secondary coil, and a 1:1 turn ratio between the two coils is included in the circuit. The primary coil is coupled in parallel with the compensation resistance. The output signal appears at an output of the secondary coil.
REFERENCES:
patent: 3680011 (1972-07-01), Adams et al.
patent: 3883833 (1975-05-01), Ozone et al.
patent: 4135132 (1971-01-01), Tafjord
patent: 4306200 (1981-12-01), Takayama
LaRoche Eugene R.
Lee Benny
Weller Douglas L.
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