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US 7,116,165 B2Granted
Front stage amplifier with different modes
AssigneeKoninklijke Philips Electronics N.V.
InventorKam Choon Kwong
Life of this patent
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Abstract
A multimode front stage amplifier and method of amplifying a signal having an optimum signal output for weak signals as well as for strong signals provided for TV tuners. A product having a multimode front stage amplifier and provisions for selecting different modes of processing the signal.
Claims17
An amplifier device, said amplifier device comprising:
- amplifier means for amplifying a radio-frequency input signal RFin,
- a controllable feedback loop for adjusting a gain and a bias voltage applied to the amplifier means for adjusting a current determining a noise level, the feedback loop and the bias voltage being arranged to provide at least two different modes, a first mode providing high gain and low noise for handling weak signals and a second mode providing low-gain power splitting for handling strong signals.
A method of amplifying a radio-frequency signal, the method comprising the step of:
- amplifying the signal in at least a first mode and a second mode by amplifier means having at least two modes, said first mode providing high gain and low noise for weak signals, and said second mode providing low-gain power splitting for handling strong signals,
- wherein the amplifier means is turned on in both the first mode and second mode to provide a higher gain and lower noise figure in the first mode, and a lower gain and higher noise figure in the second mode.
An amplifier device, comprising:
- an amplifier having a first input adapted to receive a radio frequency signal, a second input, and an output adapted to output an amplified RE signal;
- a feedback path extending between the output of the amplifier and the input of the amplifier, the feedback path having an impedance that is at least selectable between a first impedance value and a second impedance value;
- a bias voltage circuit connected to the second input of the amplifier, the bias voltage circuit being adapted to supply a bias voltage to the second input of the amplifier that is at least selectable between a first bias voltage value and a second bias voltage value;
- and
- a mode selection means adapted to select the impedance of the feedback path and to select the bias voltage to provide at least two different modes, a first mode providing high gain and low noise for handling weak signals, and a second mode providing low-gain power splitting for handling strong signals.
2 more elements
Dependencies are inferred from the claim text.