Abstract: A circuit and method are provided for supplying a DC output signal having a magnitude that is proportional to the mathematical product of a variable frequency AC signal and a variable magnitude DC signal. The method implemented by the circuit includes converting the variable frequency AC signal to a first intermediate AC signal that is a fixed pulse-width, variable period signal having a duty cycle representative of the frequency of the AC signal, and having an amplitude that varies between a first voltage magnitude and a second voltage magnitude. The first intermediate AC signal is converted to a second intermediate AC signal by setting the first intermediate AC signal amplitude equal to a third voltage magnitude when the intermediate signal amplitude is equal to the first voltage magnitude, and equal to a fourth voltage magnitude when the intermediate signal amplitude is equal to the second voltage magnitude. The second intermediate AC signal is filtered to thereby convert it to the DC voltage signal.

Abstract: A method of efficiently designing, implementing, and verifying programmed PLDs that includes translating simulation test vectors that are generated by design automation software into device level test vectors. Each of the device level test vectors is substantially identical to one of the simulation test vectors and is readable by automatic testers. Thus, the operation of programmed PLDs can be thoroughly and efficiently verified at the device level using the same test stimuli as a simulation test model.