Patent ID: 6570242
Filing Date: 2003-05-27
Classification: H01L

Abstract:
An integrated circuit, comprising:a first transistor including: a first doped buried region within a semiconductor body, said first doped buried region including a portion having a first thickness and a portion having a second thickness less than said first thickness, a first collector region disposed over said first doped buried region; a first base region within said collector region; and a first emitter region within said base region; said first collector, said first base region and said first emitter region being disposed over said buried region having a first thickness and at least said first emitter region and said first base region extending over said portion having a second thickness; and a second transistor including: a second doped buried region within said semiconductor body, said second doped buried region being substantially uniform in thickness; a second collector region over said second buried region; a second base region within said second collector region; and a second emitter region with said second base region.