Recent advances in integrated circuit (IC) technology, as well as innovations in circuit design techniques, have led to systems with processing capabilities that can supplement, or even entirely replace, complex biomedical operations such as speech spectral analysis. Importantly, however, with the right technical approach, this functionality can be achieved at power levels and form factors allowing these systems to be entirely implantable. Indeed the processing capabilities of ICs are virtually unlimited, but energy, in biomedical electronics, is highly limited. For example, if an implanted medical device were powered by a low-power general purpose processor, which consumes approximately 10 mW, current battery technology would accommodate approximately 3 days of operation. Alternatively, dedicated solutions, employing specialized low-power design techniques, consume approximately 8 μW, achieving more than 10 years of operation with the same battery (1).