| 摘要 |
<p>A signal path, such as receiver signal path of a mobile station, includes an analog to digital converter (ADC) for representing an input signal as n-bits, the n-bit representation including a DC offset component. The signal path may be one of an Inphase (I) or a Quadrature (Q) signal path of the mobile station. The signal path also includes a summing node having a first input for inputting the n-bit output of the ADC and a second input for inputting a k-bit representation of a DC offset component compensation value, where k=n+m, where m is a number of bits that represent a value smaller than one least significant bit (LSB) of said n-bit representation. The summing node operates to subtract the value appearing at the second input from the value appearing at the first input, and outputs a k-bit DC offset compensated value. In this embodiment a filter, such as a finite impulse response (FIR) filter or an infinite impulse response (IIR) filter, is coupled to the output of the summing node. A negative feedback path is provided from an output of the filter to the second input of the summing node for generating the k-bit representation of the DC offset component compensation value. In a further embodiment the summing node and the negative feedback path are placed after the FIR filter. <IMAGE></p> |
