Back to results
US 2002/0177267 A1Published application
Semiconductor chip with trimmable oscillator
AssigneeInfineon Technologies AG
InventorsPeter Beer, Carsten Ohlhoff
Life of this patent
Estimating the term…
Abstract
A semiconductor chip, particularly a semiconductor memory, has a trimmable oscillator for controlling internal functions. A circuit is provided for trimming the frequency of the oscillator and is implemented on the semiconductor chip. This guarantees a parallel setting of the oscillator frequency for a plurality of semiconductor chips without losses in yield or quality.
Claims9
A semiconductor chip, comprising:
- at least one oscillator for controlling internal functions and generates an oscillator signal with an oscillating frequency;
- and
- a trimming circuit connected to said oscillator for automatically trimming the oscillating frequency of said oscillator, said trimming circuit receiving and driven by an external clock signal having a clock frequency higher than said oscillator frequency, said trimming circuit containing a counter for measuring the oscillator frequency and a trimming logic circuit for comparing the oscillator frequency measured to a desired frequency and outputting a trim command to said oscillator corresponding to a difference between the oscillator frequency measured by said counter and the desired frequency.
Dependencies are inferred from the claim text.