Previously, we proposed novel microvalve structures, amenable to bulk micromachining, which demonstrated fully complementary behavior. Two distinct microvalves were devised, one analogous to the p-MOSFET, and the other analogous to the n-MOSFET found in complementary MOSFET devices and circuits. Ring oscillator behavior based on digital NOR logic gates was described, for both micro-pneumatics (based on compressible gas flow) and micro-hydraulics (based on incompressible liquid flow). In this work, micro-pneumatic analog circuits are described, based on the previously-described complementary digital pneumatic microvalve devices. In particular, a micro-pneumatic operational amplifier is described and simulated in detail. Also, prospects for energy harvesting or scavenging based on micro-pneumatic circuits are discussed.