Programmable dual input switched-capacitor gain stage
First Claim
Patent Images
1. A switched-capacitor gain stage comprising:
- a plurality of input nodes for a plurality of input voltage signals;
an amplifier having an amplifier input node and an amplifier output node;
a plurality of switched-capacitor arrangements, each being coupled between one of said input nodes and said amplifier input node such that each of said input nodes is coupled to a like number of said switched-capacitor arrangements; and
a switch architecture configured to cause said switched-capacitor gain stage to concurrently sample said input voltage signals, and to provide, at said amplifier output node, a series of interleaved output voltage samples derived from said input voltage signals.
23 Assignments
0 Petitions
Accused Products
Abstract
A switched-capacitor gain stage suitable for use with a pipelined analog to digital converter (“ADC”) is capable of processing two or more input channels. The analog input voltages from the multiple channels are concurrently sampled (every other clock phase), and the gain stage processes the samples using a double sampling technique, generates residual voltage samples (every clock phase), and generates digital outputs for the multiple channels in an alternating manner. The gain stage provides equal input loading for the input stages, which enhances the performance of the ADC.
38 Citations
20 Claims
-
1. A switched-capacitor gain stage comprising:
-
a plurality of input nodes for a plurality of input voltage signals;
an amplifier having an amplifier input node and an amplifier output node;
a plurality of switched-capacitor arrangements, each being coupled between one of said input nodes and said amplifier input node such that each of said input nodes is coupled to a like number of said switched-capacitor arrangements; and
a switch architecture configured to cause said switched-capacitor gain stage to concurrently sample said input voltage signals, and to provide, at said amplifier output node, a series of interleaved output voltage samples derived from said input voltage signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A switched-capacitor gain stage comprising:
-
an amplifier having an amplifier input node and an amplifier output node;
a first switched-capacitor arrangement having an input node for receiving a first input voltage signal, an output node coupled to said amplifier output node, and a feedback node coupled to said amplifier input node;
a second switched-capacitor arrangement having an input node for receiving a second input voltage signal, an output node coupled to said amplifier output node, and a feedback node coupled to said amplifier input node;
a third switched-capacitor arrangement having an input node for receiving said first input voltage signal, an output node coupled to said amplifier output node, and a feedback node coupled to said amplifier input node;
a fourth switched-capacitor arrangement having an input node for receiving said second input voltage signal, an output node coupled to said amplifier output node, and a feedback node coupled to said amplifier input node; and
a switch architecture configured to cause said switched-capacitor gain stage to concurrently sample said first input signal and said second input signal, and to provide, at said amplifier output node, a series of interleaved output voltage samples derived from said first input voltage signal and said second input voltage signal. - View Dependent Claims (12, 13, 14, 15)
-
-
16. A method of operating a switched-capacitor gain stage having a first input node, a second input node, an amplifier, first, second, third, and fourth switched-capacitor arrangements, and a switch architecture for selectively coupling the first, second, third, and fourth switched-capacitor arrangements to the first input node, the second input node, and the amplifier, said method comprising:
at a first time, switching the first switched-capacitor arrangement and the second switched-capacitor arrangement to sample a first input voltage signal present at the first input node and a second input voltage signal present at the second input node, respectively, switching the third switched-capacitor arrangement to hold its previously-sampled voltage, and switching the fourth switched-capacitor arrangement for coupling to the amplifier and a selectable reference voltage for output voltage generation. - View Dependent Claims (17, 18, 19, 20)
Specification