Shared type active slope conversion circuit used for column parallel two-step type analog-digital converter
A conversion circuit, analog-to-digital conversion technology, applied in the direction of analog-to-digital conversion, code conversion, instruments, etc., can solve the problems of power consumption and area in column-parallel architecture applications, and achieve the goal of reducing design difficulty, power consumption and area Effect
Active Publication Date: 2015-04-08
FUDAN UNIV
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[0006] Aiming at the problems of power consumption and area when the above-mentioned active slope conversion circuit is applied to the column-parallel architecture, the present invention provides a shared active slope conversion circuit, in which the working process of the active switched capacitor module is the same as that to be tested The signal is irrelevant, and the sharing of active switched capacitor modules is realized, thus solving the power consumption and area problems in column-parallel architecture applications
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[0026] image 3 It is an embodiment of the shared active slope conversion circuit of the present invention, including an active switched capacitor module (310) and N passive switched capacitor modules (320.1~320.N); the active switched capacitor module includes an operation Amplifier A1, a sampling capacitor C H0 , a parasitic balancing capacitor C M0 and six switches S 2 , S 3 , S 4 , S 5 , S 6 , S 7 ;The Kth (where K=1,2,…,N) passive switched capacitor module includes a sampling capacitor C HK , a parasitic balancing capacitor C MK and a switch S 1K . The active switched capacitor module A is shared by N passive switched capacitor modules, forming a column-parallel architecture.
[0027] Figure 4 For the convenience of the following description, in image 3 The equivalent ground parasitic capacitance C introduced by the connection and load on the node is added on the basis of PK (where K=0,1,…,N), represented by gray fonts and lines; C PK with the correspondi...
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The invention belongs to the technical field of a column parallel framework analog-digital converter and particularly provides a shared type active slope conversion circuit used for a column parallel two-step type analog-digital converter. The shared type active slope conversion circuit used for the column parallel two-step type analog-digital converter comprises two parts, namely an active switched capacitor module and passive switched capacitor modules. The active switched capacitor module is composed of an operational amplifier, a sampling capacitor, a parasitic balance capacitor and six switches, and the working state is not related with a signal to be detected; each passive switched capacitor module is composed of a sampling capacitor, a parasitic balance capacitor and a switch, and the working state is determined by the signal to be detected. When the shared type active slope conversion circuit is applied to a column parallel framework, the column parallel passive switched capacitor modules share one active switched capacitor module. With the adoption of the shared type active slope conversion circuit, the power consumption and the area of the column parallel two-step type analog-digital converter can be effectively reduced.
Description
technical field [0001] The invention belongs to the technical field of analog-to-digital converters with a column-parallel architecture, and in particular relates to a slope conversion circuit for an integrated circuit used in a two-step analog-to-digital converter with a column-parallel architecture. Background technique [0002] In the known circuit, the principle of the two-step single-slope single-slope integral analog-to-digital converter is as follows figure 1 Shown, its function is to test the signal V IN Quantized to B-bit digital output D<B-1,0>. It consists of a conventional ramp conversion circuit 110, a comparator 120, a latch and adder 130, a count and controller 140, and a ramp signal generator 150 (usually implemented with a digital-to-analog converter). Since the conventional ramp conversion circuit 110 is a passive circuit, it is called a passive ramp conversion circuit herein. It consists of a capacitor C 11 and S D , S E , S R It consists of t...
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Inventor 程旭李立郭东东曾晓洋
Owner FUDAN UNIV