Patent ID: 8207774

Claim:
A constant envelope signal generating circuit, comprising: a first constant envelope signal generator circuit for adding a first constant envelope vector generation signal, which is orthogonal to an input signal, to the input signal to generate a first constant envelope signal; a second constant envelope signal generation circuit for adding a second constant envelope vector generation signal, which is obtained by inverting the first constant envelope vector generation signal in phase, to the input signal to generate a second constant envelope signal; a first amplitude detector circuit for detecting an amplitude of the first constant envelope signal; a second amplitude detector circuit for detecting an amplitude of the second constant envelope signal; an amplitude control circuit for changing the amplitudes of the first constant envelope vector generation signal and the second constant envelope vector generation signal based on the amplitudes detected by the first amplitude detector circuit and the second amplitude detector circuit; a voltage holding circuit for holding voltages; a correction circuit for correcting a detection sensitivity of the first amplitude detector circuit and the second amplitude detector circuit based on the voltage held by the voltage holding circuit, wherein, at a given timing, a given reference signal for controlling sensitivity of the first amplitude detector circuit and the second amplitude detector circuit is input as the input signal, wherein, when the given reference signal is input as the input signal, the first amplitude detector circuit detects an amplitude of the given reference signal as a first amplitude, wherein, when the given reference signal is input as the input signal, the second amplitude detector circuit detects an amplitude of the given reference signal as a second amplitude, wherein the voltage holding circuit holds a first voltage denoting a difference between the first amplitude and an arbitrary reference amplitude and holds a second voltage denoting a difference between the second amplitude and the reference amplitude, and wherein the correction circuit corrects the detection sensitivity of the first amplitude detector circuit and the second amplitude detector circuit based on the first voltage and the second voltage respectively.