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US 7,023,294 B2Granted
System and a method for reducing tilt effects in a radio frequency attenuator
AssigneeGeneral Instrument Corporation
InventorsMichael E. Hauger, William T. Homiller
Life of this patent
Estimating the term…
Abstract
A system for reducing tilt effects in a radio frequency (RF) attenuator includes an RF attenuator having at least one series diode, and at least one shunt branch including at least one shunt diode, the shunt branch being electrically coupled to the series diode, and a parallel resonant circuit electrically coupled to each of the at least one shunt branch, wherein the parallel resonant circuit is configured to compensate for a parasitic reactance in the RF attenuator.
Claims20
An RF attenuator comprising:
- an RF signal input;
- an RF signal output;
- a first and a second series diode coupled in series with said RF signal input and said RF signal output;
- a first shunt branch electrically coupled to said RF attenuator between said RF signal input and said first and second series diodes, said first shunt branch including a plurality of shunt diodes;
- a second shunt branch electrically coupled to said RF attenuator between said RF signal output and said first and second series diodes, said second shunt branch including a plurality of shunt diodes;
- and
- a first parallel resonant circuit electrically coupled in series to said first shunt branch and a second parallel resonant circuit electrically coupled in series to said second shunt branch.
4 more elements
A system for reducing tilt effects in a radio frequency (RF) attenuator comprising:
- an RF attenuator including at least one series diode, and at least one shunt branch having at least one shunt diode, said shunt branch being electrically coupled to said series diode;
- a parallel resonant circuit electrically coupled to each of said at least one shunt branch, wherein said parallel resonant circuit is configured to compensate for a parasitic reactance in said RF attenuator;
- a shunt bias input electrically coupled to said at least one shunt branch, wherein said shunt bias input is configured to route a first direct current (DC) bias current to said at least one shunt diode;
- and
- a series bias input electrically coupled to said at least one series diode, wherein said series bias input is configured to route a second DC bias to said at least one series diode;
- wherein said first and said second DC bias are configured to establish an impedance of said at least one shunt diode and said at least one series diode, said at least one series diode and said at least one shunt diode comprise positive-intrinsic-negative (PIN) diodes, and said parallel resonant circuit is coupled in series with said at least one shunt branch from a received RF signal perspective.
3 more elements
A signal transmitter comprising:
- an RF input;
- a PIN attenuator with tilt correction;
- and
- a signal output;
- wherein said PIN attenuator includes an RF signal input, an RF signal output, a first and a second series diode coupled in series with said RF signal input and said RF signal output, a first shunt branch electrically coupled to said RF attenuator between said RF signal input and said first and second series diodes, said first shunt branch including a plurality of shunt diodes, a second shunt branch electrically coupled to said RF attenuator between said RF signal output and said first and second series diodes, said second shunt branch including a plurality of shunt diodes, and a first parallel resonant circuit electrically coupled in series to said first shunt branch and a second parallel resonant circuit electrically coupled in series to said second shunt branch.
2 more elements
A system for reducing tilt effects in a radio frequency (RF) attenuator comprising:
- an RF attenuator including at least one series diode, and at least one shunt branch having at least one shunt diode, said shunt branch being electrically coupled to said series diode;
- a parallel resonant circuit electrically coupled to each of said at least one shunt branch, wherein said parallel resonant circuit is configured to compensate for a parasitic reactance in said RF attenuator;
- a shunt bias input electrically coupled to said at least one shunt branch, wherein said shunt bias input is configured to route a first direct current (DC) bias current to said at least one shunt diode;
- and
- a series bias input electrically coupled to said at least one series diode, wherein said series bias input is configured to route a second DC bias to said at least one series diode;
- wherein said first and said second DC bias are configured to establish an impedance of said at least one shunt diode and said at least one series diode, said at least one series diode and said at least one shunt diode comprise positive-intrinsic-negative (PIN) diodes, said parallel resonant circuit comprises an inductor, and a capacitor electrically coupled in parallel, and said parallel resonant circuit further comprises a resistor electrically coupled in parallel with said inductor and said capacitor, wherein said resistor is configured to limit a maximum impedance of said parallel resonant circuit.
3 more elements
Dependencies are inferred from the claim text.