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Mp syokohama 20170520_circuits_vol_5
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正雄 上野
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Mp syokohama 20170520_circuits_vol_5
1.
オペアンプの基礎 5/20/ 2017 C 2017 MPSyokohama
2.
■ 本日のメニュー ■ ・[1] オペアンプの基礎 ・[2] オペアンプを使った増幅回路 (LTspice による .AC 解析)
3.
オームの法則 V(電圧) R(抵抗) I(電流) トランジスタ技術 2014 4月参照 電圧[v] 電流[A]
4.
V1 V2 V0 + - - + - + X I0 I1 I2 I0
-I1 - I2 = 0 V1 +V2 - V0= 0 キルヒホッフの法則
5.
オペアンプ(OP Amp) + - Vin+ Vin- VoutA A
: 増幅率 :大きい Vin+,Vin- の入力抵抗 :非常に大きい Vout の出力抵抗 :ゼロ そしてVout には A・[(Vin+) - (Vin-)] が出力されます。 Vss Vcc
6.
+ - Vin+ Vin- A Ri Ro vi AGND Analog Ground vovx i0 i1 (Vi -Vx) Ro (Vx
-Vo)= - - -(2) A ->無限大 R1 R0 =vo- - -(4)(-vi ) (1),(2)式より R0<R1 なら増幅回路となる 0=vx Vin- とVin+ が同じ電位 仮想接地(バーチャルショート) Ri Ro - - - (1) (0 -Vx) A = V0 Vss Vcc i0 i1
7.
+ - Vin+ Vin- A vi AGND Analog Ground vo vx i0 (vi -vx)A=vo
- - - (1) (vi )A (1+A) =vo- - -(3) A ->無限大 vi =vo (2)式より vx=vo (vi -vo)A=vo - - - (2) 入力- と入力+ が同じ電位 仮想接地(バーチャルショート) 上式より Vss Vcc
8.
+ - A R1 Rout v1 AGND voutvx i1 iout (Vx -Vout) + -
- -(1) A ->無限大 入力- と入力+ が同じ電位 仮想接地(バーチャルショート) v2 i2 R2 Rout = (V2 -Vx) R1 R2 (V1 -Vx) Vx = 0 (仮想接地) Vout = -R0( ) R1 + V2 R1 R2 V1 Vss Vcc i2iout i1
9.
LTspice でOp Amp
の動作を確認
10.
11.
OpAmp を選びます LT1001 にしました
12.
電源 voltage
13.
GND を発生
14.
抵抗 res を発生 [control]
+ [R]で横置き
15.
配線
16.
電源の値を入れる 電源の値を与えます
17.
素子の値を 与えます
18.
sin 波形を入れる 済みません訂正します AC Amplitude: に値
1 を入れて下さい
19.
回路図完成 !
20.
解析の種類を決める
21.
AC 解析を行う
22.
23.
24.
25.
26.
(筋電計の回路図) + - 10μF MAU106 IN- IN+ +5vGND -5v +5v RG Vref Vref Vout Vref(0V) RG +5v -5v LT1167 10μF 100Ω 820Ω 0.1μF 0.1μF ( 村岡研究室 筋電計回路
)
27.
お疲れ様でした
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