Patent ID: 6472933
Filing Date: 2002-10-29
Classification: H03F

Abstract:
A quaternary switching amplifier comprising:a quaternary amplifier input signal; and an H-bridge circuit, the H-bridge circuit is coupled to receive the quaternary input signal, the H-bridge comprising four input control signal ports coupled to receive the quaternary input signal to control an amplifier output of the H-bridge circuit to swing between a positive state (+1) and a negative state (âˆ’1) and to provide error cancellation in the amplifier output of the H-bridge circuit, the H-bridge circuit further comprising two pairs of switches, a first pair of switches including a first transistor (AH) and a second transistor (AL), and a second pair of switches comprising a third transistor (BH) and a fourth transistor (BL), a load coupled to the two pairs of switches via a positive node (V+) and a negative node (Vâˆ’), the amplifier output of the H-bridge comprising a voltage difference across the load, between the node (V+) and the node (Vâˆ’), wherein each transistor comprises a first terminal, a second terminal, and a third input switch control terminal, with a first terminal of transistors AH and BH coupled to a positive power supply (VP), and a second terminal of transistor AH coupled to the load via the positive node V+ and a second terminal of BH coupled to the load via the negative node Vâˆ’, wherein a first terminal of AL and BL coupled to a negative power supply (VM), and a second terminal of transistor AL is coupled to the load via the node V+ and a second terminal of BL is coupled to the load via the node Vâˆ’, and wherein the third input switch control terminal of each transistor is coupled to receive the quaternary input signal comprising a signal waveform alternating between a 0H state and a 0L state in between a non-zero state transition.