 |
Os motores de busca de Datasheet de Componentes eletrônicos |
|
|
Os motores de busca de Datasheet de Componentes eletrônicos |
|
OP270 Folha de dados(PDF) 16 Page - Analog Devices |
|
||||||||||||||||||||||||||||||
OP270 Folha de dados(HTML) 16 Page - Analog Devices |
|
|
16 / 20 page  OP270 Rev. E | Page 16 of 20 LOW PHASE ERROR AMPLIFIER The simple amplifier depicted in Figure 41 utilizes a monolithic dual operational amplifier and a few resistors to substantially reduce phase error compared with conventional amplifier designs. At a given gain, the frequency range for a specified phase accuracy is more than a decade greater than that of a standard single op amp amplifier. The low phase error amplifier performs second-order fre- quency compensation through the response of Op Amp A2 in the feedback loop of A1. Both op amps must be extremely well matched in frequency response. At low frequencies, the A1 feedback loop forces V2/(K1 + 1) = VIN. The A2 feedback loop forces VO/(K1 + 1) = V2/(K1 + 1), yielding an overall transfer function of VO/VIN = K1 + 1. The dc gain is determined by the resistor divider at the output, VO, and is not directly affected by the resistor divider around A2. Note that, like a conventional single op amp amplifier, the dc gain is set by resistor ratios only. Minimum gain for the low phase error amplifier is 10. 1/2 OP270E A2 1/2 OP270E A1 R1 VO V2 VIN R1 K1 R2 R2 = R1 ωT s R2 K2 VO = (K1 + 1)VIN ASSUME A1 AND A2 ARE MATCHED. AO(s) = Figure 41. Low Phase Error Amplifier Figure 42 compares the phase error performance of the low phase error amplifier with a conventional single op amp amplifier and a cascaded two-stage amplifier. The low phase error amplifier shows a much lower phase error, particularly for frequencies where ω/βωT < 0.1. For example, a phase error of −0.1° occurs at 0.002 ω/βωT for the single op amp amplifier, but at 0.11 ω/βωT for the low phase error amplifier. –7 –6 –5 –4 –3 –2 –1 0 FREQUENCY RATIO (1/βω)(ω/ωT) 0.001 0.005 0.01 0.1 1 LOW PHASE ERROR AMPLIFIER CASCADED (TWO STAGES) SINGLE OP AMP. CONVENTIONAL DESIGN 0.05 0.5 Figure 42. Phase Error Comparison FIVE-BAND, LOW NOISE, STEREO GRAPHIC EQUALIZER The graphic equalizer circuit shown in Figure 43 provides 15 dB of boost or cut over a five-band range. Signal-to-noise ratio over a 20 kHz bandwidth is better than 100 dB and referred to a 3 V rms input. Larger inductors can be replaced by active inductors, but consequently reduces the signal-to-noise ratio. 1/2 OP270E 1/2 OP270E R2 3.3kΩ R1 47kΩ R4 1kΩ 60Hz TANTALUM VOUT VIN R14 100Ω R13 3.3kΩ C2 6.8µF L1 1H C1 0.47µF R3 680Ω 200Hz R6 1kΩ 800Hz R8 1kΩ 3kHz R10 1kΩ 10kHz R12 1kΩ + TANTALUM C3 1µF L2 600mH R5 680Ω + C4 0.22µF L3 180mH R7 680Ω + C5 0.047µF L4 60mH R9 680Ω + C6 0.022µF L5 10mH R11 680Ω + Figure 43. Five-Band, Low Noise Graphic Equalizer |
Nº de peça semelhante - OP270 |
|
Descrição semelhante - OP270 |
|
|
|
Ligação URL |
| Privacy Policy |
| ALLDATASHEETPT.COM |
| ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Portuguese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
