An apparatus for providing an angle modulated signal includes a tunable oscillator circuit, a variable time delay circuit, and an optional scaling and delay control apparatus. The tunable oscillator circuit generates an oscillatory signal having a predetermined frequency. The variable time delay circuit operates to delay the oscillatory signal in accordance with time varying changes in an angle control signal, thereby producing the desired angle modulated signal. The scaling and delay control apparatus is configured to scale the angle control signal to account for frequency dependent phase delays of the oscillatory signal through the variable time delay circuit. The methods and apparatus of the present invention may be advantageously used in RF transmitters and receivers, such as in a polar transmitter, where the oscillatory signal generated by the tunable oscillator apparatus serves as a carrier signal, and the angle control signal used to control the delay of the variable time delay circuit comprises a phase modulation signal from the phase path of the polar transmitter.