Patent ID: 7474170
Filing Date: 2009-01-06
Classification: H03F,H03H

Abstract:
1. An attenuator comprising: a first diode having an anode connected to an input terminal and a cathode connected to an output terminal; a first control voltage terminal connected to the anode of the first diode; a first capacitor; a second diode having an anode connected to the cathode of the first diode and a cathode connected to the anode of the first diode via the first capacitor; a first resistor having a first end connected to the cathode of the second diode; a second capacitor; a second resistor having a first end connected to the cathode of the first diode via the second capacitor; a third capacitor; a third diode having an anode connected to second ends of the first resistor and the second resistor via the third capacitor; a fourth capacitor; a fourth diode having a cathode connected to the second ends of the first resistor and the second resistor via the fourth capacitor; a fifth capacitor having a first end connected to the cathode of the third diode and the anode of the fourth diode and a second end that is grounded; a second control voltage terminal connected to the cathode of the second diode; a third control voltage terminal connected to the anode of the third diode; a fourth control voltage terminal connected to the cathode of the fourth diode; and a linearizer provided between the input terminal and the anode of the first diode, wherein the linearizer comprises