Radio receivers
AssigneeU.S. Philips Corporation
InventorKnud Holtvoeth
Life of this patent
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Abstract
A receiver including an rf amplifier(14) having an input, an output and a gain control input(38), for deriving a gain control signal. A gain control (36) responsive to the gain control signal. The gain control (36) comprises at least 2 parallel arranged bias currents (40,42,44), at least one(42 or 44) of the 2 bias current means including switching means(SW1 or SW2) responsive to a control voltage varying by a predetermined amount relative to a reference voltage(V.sub.ref1 or V.sub.ref2) for actuating the switching means(SW1 or SW2) to connect or disconnect the bias current (42 or 44) to or from the gain control input.
Claims6
A receiver including an rf amplifier having an input,an output and a gain control input, and gain control means for applying a gain setting signal to said gain control input, the gain control means comprising at least 2 parallel arranged bias current means, at least one of said at least 2 bias current means including switching means responsive to a control signal varying by at least a predetermined amount relative to a reference signal for actuating the switching means to connect or disconnect the bias current means to or from the gain control input.
Dependencies are inferred from the claim text.