Patent ID: 6369638
Filing Date: 2002-04-09
Classification: H03F

Abstract:
A power drive circuit including:a first push-pull type output transistor section connected between a main power supply having a potential and a ground; a first input control section, connected between an auxiliary power supply having a potential and said ground, for receiving an input signal and an output reference potential to provide said first push-pull type output transistor section with a first control signal; a second push-pull type output transistor section connected between said main power supply and said ground; a second input control section connected between said auxiliary power supply and said ground, for receiving said output reference potential and an inverted input signal, which is an inversion of said input signal, to provide said second push-pull type output transistor section with a second control signal, wherein each of said first and said second output transistor sections provides one of two different dynamic ranges, a first dynamic range for a first mode where said potential of said auxiliary power supply is equal to said potential of said main power supply and a second dynamic range for a second mode where said potential of said auxiliary power supply is higher than said potential of said main power supply; and said power drive circuit wherein said output reference potential matches the medium of the dynamic ranges of said first and second output transistor sections.