Summary: A well-known scheme for obtaining high throughput adders is a pipeline in which each stage contains an array of half-adders performing a carry-save addition. This paper shows that other schemes can be designed, based on the idea of pipelining a serial-input adder or a ripple-carry adder. Such schemes offer a considerable savings of components while preserving high throughput. These schemes can be generalized by using \((p,q)\) parallel counters to obtain pipelined adders for more than two numbers.