US Patent 7587190 Systems and methods for low power clock generation

Various systems and methods for low power identification are described herein. For example, a radio frequency device including a radio frequency energy receiver. The radio frequency energy receiver is operable to receive a radio frequency energy and to convert the radio frequency energy to a DC current. In addition, the device further includes a first clock generator that generates a first clock at a first frequency and second clock generator that generates another clock based on the first clock. The first clock generator includes a duty cycle correction circuit. The second clock has a positive going clock edge for each edge of the first clock.