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US 7,184,731 B2Granted
Variable attenuator system and method
OwnerGi Mun Kiminventor
Life of this patent
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Abstract
A variable attenuator comprising a first attenuator for attenuating a RF signal according to a fixed voltage, a second attenuator connected in parallel to the first attenuator and attenuating the RF signal according to a control voltage for determining an attenuation mode, and a first impedance matching unit for maintaining input/output impedance matching of the second attenuator.
Claims23
A variable attenuator comprising:
- a first attenuator for attenuating a RF signal according to a fixed voltage;
- a second attenuator connected in parallel to the first attenuator and attenuating the RF signal according to a control voltage for determining an attenuation mode;
- and
- a first impedance matching unit for maintaining input/output impedance matching of the second attenuator,
- wherein the second attenuator comprises:
- a third capacitor connected in parallel to an input terminal of the first attenuator,
- a first diode for attenuator the RF signal transmitted through the third capacitor, and
- a second diode connected in parallel to an output terminal of the first attenuator.
5 more elements
A variable attenuator comprising:
- a first attenuator for attenuating a RF signal according to a first voltage;
- a first impedance matching unit for maintaining impedance matching of the first attenuator in a low attenuation mode;
- a second attenuator provided between input and output terminals of the first attenuator for attenuating the RF signal according to a control voltage for determining an attenuation mode,
- wherein the second attenuator comprises:
- a third capacitor connected in parallel to an input terminal of the first attenuator for cutting off a control voltage to the first attenuator;
- a first diode for attenuating the RE signal transmitted through the third capacitor;
- a second diode connected in parallel to an output terminal of the first attenuator;
- and
- first and second resistance means corrected to anodes of the first and second diodes for applying the control voltage;
- and
- a second impedance matching unit for maintaining input/output impedance matching of the second attenuator in a high attenuation mode,
- wherein the second impedance matching unit comprises at least two resistors provided between the second attenuator and a ground connection.
9 more elements
A variable attenuator comprising:
- a first diode for attenuating a RF signal according to a first voltage;
- a second diode, connected in parallel to an anode of the first diode for attenuating the RF signal, according to a control voltage;
- a third diode connected in parallel to a cathode of the first diode for attenuating the RF signal, according to the control voltage;
- a first resistor provided between a cathode of the second diode and a ground connection;
- and
- a second resistor provided between a cathode of the third diode and the ground connection.
3 more elements
A variable attenuator comprising:
- a first attenuator for attenuating a RF signal according to a fixed voltage;
- a second attenuator connected in parallel to the first attenuator and attenuating the RF signal according to a control voltage for determining an attenuation mode;
- and
- a first impedance matching unit for maintaining input/output impedance matching of the second attenuator,
- wherein the second attenuator comprises:
- a first diode connected in parallel to an input terminal of the first attenuator;
- and
- a second diode connected in parallel to an output terminal of the first attenuator
- a third capacitor connected in parallel to an input terminal of the fist attenuator;
- wherein the first diode attenuates the RF signal transmitted through the third capacitor.
7 more elements
Dependencies are inferred from the claim text.