Abstract: A signal processing circuit comprising a chopper amplifier in combination with a circuit or device having an acquisition period, and wherein a clock controlling the chopper amplifier is controlled such that a predetermined or known number of clock transitions occur during the acquisition period.
Type:
Application
Filed:
April 12, 2011
Publication date:
October 20, 2011
Applicant:
Rolls-Royce Goodrich Engine Control Systems Limited
Abstract: A fuel control system comprises a metering valve operable to control the flow of fuel between a supply line and a delivery line, a spill valve operable to control fuel flow within the supply line, a pressure raising valve connected to the delivery line, and a control servo valve movable between a thrust control mode in which it modifies the control of the spill valve to reduce the fuel flow delivered via the metering valve and an outlet of the pressure raising valve, and a windmill relight position in which it modifies the control of the pressure raising valve to allow fuel delivery through the outlet of the pressure raising valve at a reduced system pressure.
Type:
Application
Filed:
December 8, 2010
Publication date:
June 23, 2011
Applicant:
Rolls-Royce Goodrich Engine Control Systems Limited
Inventors:
Michael Griffiths, Daniel James Bickley