Category:
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
0
1
2
3
4
5
6
7
8
9
Position:IcFull.com » IC Electronic information » Category: A

IC Electronic information

Analog switch based on single chip design and simulation of timing

In Electronic Infomation Category: A | on April 15,2011

With the rapid development of modern industry, on the working parameters of the real-time monitoring is increasingly important. Monitoring parameters are divided into two major categories of quantity of electricity and, for non-power parameters of measurement, measurement of success depends largely on the quality of the sensor and TPS62000DGSR datasheet and signal extraction. The capacitance sensor has a simple structure, low power consumption, wide measurement range, good stability, high sensitivity, long life and TPS62000DGSR price and can be non-contact measurement and TPS62000DGSR suppliers and so on, very suitable for high humidity, high dust, strong radiation and ultra-low temperature and other harsh environments Under the long-term use, therefore, slow or small for some physical changes, a more appropriate use of capacitive sensors.

Micro-capacitor current method for measuring the exchange of the main method, the measurement principle is a continuous stimulus to the measured capacitance charge and discharge, the formation and measured capacitance is proportional to the voltage or current signal, which measured the measured capacitance value. The signal measured by this method has a pulse noise filter needs to filter the ripple component, but the introduction of the filter will reduce the speed of the measuring circuit signal acquisition. Therefore, we designed charge amplifier based on the principle of micro-capacitance measurement circuit, the analog switches that charge injection effect, the effect of the resolution of the circuit. To solve this problem, this paper micro-capacitance measuring circuit to start the charge injection effect, the analog switch charge injection effects analysis, combined with single chip design of the switch timing, and Proteus, and Keil software design based on circuit simulation, and then test the design is reasonable.

1 micro-capacitance measurement circuit of the charge injection effect

Based on the principle of micro-capacitor charge amplifier measurement circuit shown in Figure 1.


Figure 1 is based on the principle of the micro-capacitor charge amplifier measuring circuit Vin

diagram for the charging and discharging of the excitation voltage source, CX is the capacitance of the sensor between two plates that is under test capacitor; S1 ~ S5 for the analog switch; operational amplifier A1, capacitor Cf, Rf resistance constitutes a charge amplifier and switch S3 ; switches S4 and S5 and the op amp A2 and A3 constitute two sample and hold devices, A4 for the instrumentation amplifier. NMOS analog switch basically consists of a parallel tube and a tube made of PMOS, is a three-state circuit, it can end according to the level strobe input decisions and output side of the state. Elected to pass at the gate terminal state, the state of the output depends on the input side of the state; elected to pass when the end is off, then no matter how the input level, output high impedance state were tested.

Full Text PDF Download: analog switch based on single chip design and simulation of timing. Pdf

TPS62000DGSR datasheetTPS62000DGSR suppliersTPS62000DGSR Price

All right reserved:icfull.com © 2010-2016 Certificate