Methods and apparatus for noise shaping a mixed signal power output
First Claim
Patent Images
1. A signal processing circuit for processing an input signal, comprising:
- a frequency selective network;
an amplification stage coupled to the frequency selective network, the amplification stage comprising a switching amplifier, an analog amplifier, and an output terminal;
at least one continuous-time feedback path from the output terminal of the amplification stage to the frequency selective network; and
switching circuitry for alternately enabling the switching and analog amplifiers for processing of the input signal, the switching circuitry comprising level detection circuitry for monitoring a signal level indicative of the input signal, and wherein the switching circuitry is configured to alternately enable the switching and analog amplifiers in response to the signal level such that where the signal level is below a first threshold level the input signal is processed with the analog amplifier, and where the signal level is above the first threshold level the input signal is processed with the switching amplifier.
10 Assignments
0 Petitions
Accused Products
Abstract
A signal processing circuit and method for processing an input signal are described. The circuit includes a frequency selective network, an amplification stage, and at least one continuous-time feedback path from the output of the amplification stage to the frequency selective network. The amplification stage includes a switching amplifier and an analog amplifier. Switching circuitry alternately enables the switching and analog amplifiers for processing of the input signal.
35 Citations
28 Claims
-
1. A signal processing circuit for processing an input signal, comprising:
-
a frequency selective network;
an amplification stage coupled to the frequency selective network, the amplification stage comprising a switching amplifier, an analog amplifier, and an output terminal;
at least one continuous-time feedback path from the output terminal of the amplification stage to the frequency selective network; and
switching circuitry for alternately enabling the switching and analog amplifiers for processing of the input signal, the switching circuitry comprising level detection circuitry for monitoring a signal level indicative of the input signal, and wherein the switching circuitry is configured to alternately enable the switching and analog amplifiers in response to the signal level such that where the signal level is below a first threshold level the input signal is processed with the analog amplifier, and where the signal level is above the first threshold level the input signal is processed with the switching amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 27)
-
-
14. A signal processing circuit for processing an input signal, comprising:
-
a frequency selective network;
an amplification stage coupled to the frequency selective network, the amplification stage comprising a switching amplifier, an analog amplifier, and an output terminal;
at least one continuous-time feedback path from the output terminal of the amplification stage to the frequency selective network; and
switching circuitry for alternately enabling the switching and analog amplifiers for processing of the input signal, the switching circuitry comprising level detection circuitry for monitoring a signal level indicative of the input signal, and wherein the switching circuitry is configured to alternately enable the switching and analog amplifiers in response to the signal level such that where the signal level is above a first threshold level the input signal is processed with the analog amplifier, and where the signal level is below the first threshold level the input signal is processed with the switching amplifier. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28)
-
Specification