Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

[Question] Hartley and Weaver Architecture

Status
Not open for further replies.

currentmirror2000

Member level 4
Joined
Dec 21, 2004
Messages
77
Helped
6
Reputation
16
Reaction score
1
Trophy points
1,288
Activity points
798
Hi all,

i'm wondering in these two architectures, why not to put one low pass filter after the IF output instead of putting two low pass filters after the first two mixers. so one low pass filter will be saved.

thanks in advance

c.m.
 

e.Horus

Junior Member level 3
Joined
Feb 14, 2006
Messages
30
Helped
3
Reputation
6
Reaction score
0
Trophy points
1,286
Activity points
1,581
1. You usually need the IF output in quadrature for modern modulation schemes.

2. In the Weaver receiver you cannot do that because you need to attenuate the secondary image.
 

currentmirror2000

Member level 4
Joined
Dec 21, 2004
Messages
77
Helped
6
Reputation
16
Reaction score
1
Trophy points
1,288
Activity points
798
thank you.

1). but i'm refering to the simple receiver architectures which are discussed in Razavi's book; there is no I/Q

2). i suppose in the weaver receiver, BP filters are needed to filter out the secondary image; with LP filters, there is no way to filter out the secondary image, then why not put one LP filter after the IF signal?

thanks,

c.m.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top