 |
Moteur de recherche de fiches techniques de composants électroniques |
|
|
Moteur de recherche de fiches techniques de composants électroniques |
|
AD831APZ Fiches technique(PDF) 9 Page - Analog Devices |
|
||||||||||||||||||||||||||||||
AD831APZ Fiches technique(HTML) 9 Page - Analog Devices |
|
|
9 / 16 page  AD831 –8– AD831 –9– For gains other than unity, the amplifier’s output at OUT is connected via an attenuator network to VFB; this determines the overall gain. Using resistors R1 and R2 (Figure 6), the gain setting expression is G R R R dB = + Ê ËÁ ˆ ¯˜ 20 1 2 2 10 log (2) �� �� �� ������ ��� �� ��� �� ��� �� ��� ��� �� �� ��� ��� �� ��� ���� �� ��� ��� � � � � � � �� �� �� �� �� ��� ��� ��� �� �� �� �� �� � � � �� �� ����� �������� Figure 6. Output Amplifier Feedback Connections for Increasing Gain Driving Filters The output amplifier can be used for driving reverse-terminated loads. When driving an IF band-pass filter (BPF), for example, proper attention must be paid to providing the optimal source and load terminations so as to achieve the specified filter response. The AD831’s wideband highly linear output amplifier affords an opportunity to increase the RF to IF gain to compensate for a filter’s insertion and termination losses. Figure 7 indicates how the output amplifier’s low impedance (voltage source) output can drive a doubly terminated band-pass filter.The typical 10 dB of loss (4 dB of insertion loss and 6 dB due to the reverse-termination) be made up by the inclusion of a feedback network that increases the gain of the amplifier by 10 dB (3.162).When constructing a feedback circuit, the signal path between OUT and VFB should be as short as possible. �� �� �� ������ ��� �� ��� �� ��� �� ��� ��� �� �� ��� ��� �� ��� ���� �� � � � � � � �� �� �� �� �� ��� ��� ��� �� �� �� �� �� � � � �� �� �� ��� �� ����� �������� ��� ��� ����� ���� Figure 7. Connections for Driving a DoublyTerminated Band-Pass Filter Higher gains can be achieved, using different resistor ratios, but with concomitant reduction in the bandwidth of this amplifier (Figure 8). Note also that the Johnson noise of these gain setting resistors, as well as that of the BPF terminating resistors, is ulti- mately reflected back to the mixer’s input; thus they should be as small as possible, consistent with the permissible loading on the amplifier’s output. FREQUENCY (MHz) 12 10 0 10 1000 100 8 6 4 2 G = 1 G = 2 G = 4 Figure 8. Output Amplifier 1 dB Compression Point for Gains of 1, 2, and 4 (Gains of 0 dB, 6 dB, and 12 dB, Respectively) REV. C REV. C |
Numéro de pièce similaire - AD831APZ |
|
Description similaire - AD831APZ |
|
|
|
Lien URL |
| Politique de confidentialité |
| ALLDATASHEET.FR |
| ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants 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 |
French ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
