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| AND8054 Datasheet, PDF (10/28 Pages) ON Semiconductor – Designing RC Oscillator Circuits with Low Voltage Operational Amplifiers and Comparators for Precision Sensor Applications | |||
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AND8054/D
Absolute Oscillator (with C4)
Ǹ Ǹ Step 2: Solve N(s) using Method II shown in Appendix II: wo +
a3
a1
+
a2
a0
N(s) + a0s3 ) a1s2 ) a2s ) a3 + s3R1R2R3R4C1C2C4 ) s2R1R2R3C1C2 ) R4
a0 + R1R2R3R4C1C2C4
a1 + R1R2R3C1C2
a2 + 0
a3 + R4
Ǹ Ǹ wo +
a3
a1
+
R4
R1R2R3C1C2
Absolute Oscillator
Step 3a: Subcircuit Oscillation Design Equations
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Absolute Oscillator
Without C4
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ N(s)
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ wo
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ Oscillation Period
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ P
+
2p
wo
R1R2R3C1C2s2 ) R4
Ǹ R4
R1R2R3C1C2
P ^ 2pR ǸC1C2
If R1 = R2 = R and R3 = R4
With C4
R1R2R3R4C1C2C4s3 ) R1R2R3C1C2s2 ) R4
Ǹ R4
R1R2R3C1C2
P ^ 2pR ǸC1C2
If R1 = R2 = R and R3 = R4
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