| We have implemented a very high throughput digital IIR filter that operates at 500 MHz using the IBM 130nm process at 1.2V. Critical to this achievement is the use of a Generalized Carry-Save (GCS) approach, a pipelined IIR filter implementation and, very importantly, a novel implementation of the quantizer. In conventional digital IIR filter design the quantizer delay was a major factor that limited the throughput of the filter. Thus, this technique which has not been previously reported is a main contribution of this work. Maximizing the throughput of digital filters is an important topic today due to the need for low power circuit designs. Even if a lower throughput is desired, first maximizing the throughput and then lowering the power supply voltage to just meet the throughput requirement yields the lowest energy implementation as the energy is quadratically related to the supply voltage. |
