Patent ID: 7005896
Filing Date: 2006-02-28
Classification: H03L

Abstract:
1. A high-speed low-noise charge pump comprising: an output node; a first cascode current mirror coupled to a first reference current source and adapted to generate a first mirror current, including: a second cascode current mirror coupled to a second reference current source and adapted to generate a second mirror current, including: a first switching transistor being turned on during assertion of a first control signal to cause the first mirror current to flow through the output node, having a gate, a source and a drain where the source of the first switching transistor is coupled to the first output mirror transistor, the drain of the first switching transistor is coupled to the first output cascode transistor, and the gate of the first switching transistor receives the first control signal; and a second switching transistor being turned on during assertion of a second control signal to cause the second mirror current to flow through the output node, having a gate, a source and a drain where the source of the second switching transistor is coupled to the second output mirror transistor, the drain of the second switching transistor is coupled to the second output cascode transistor, and the gate of the second switching transistor receives the second control signal, and wherein the first input mirror transistor has a gate coupled to the first output mirror transistor and a source coupled to the ground; wherein the first input cascode transistor has a gate coupled to the first output cascode transistor and a drain coupled to the gate of the first input mirror transistor and the first reference current source; wherein the second input mirror transistor has a gate coupled to the second output mirror transistor and a source coupled to the voltage supply; and wherein the second input cascode transistor has a gate coupled to the second output cascode transistor and a drain coupled to the gate of the second input mirror transistor and the second reference current source.