What is meant by 'local' in local oscillator?
$begingroup$
We know that a local oscillator (LO) is an electronic oscillator used with a mixer to change the frequency of a signal.
- But what do we mean by 'local'?
- How is 'local oscillator' different from normal oscillator?
- Why a
normal oscillator like LC-tank circuit or an opamp circuit can't be used in
heterodyne receiver?
oscillator terminology
asked 8 hours ago
ShadowShadow
185312
$endgroup$
add a comment |
$begingroup$
We know that a local oscillator (LO) is an electronic oscillator used with a mixer to change the frequency of a signal.
- But what do we mean by 'local'?
- How is 'local oscillator' different from normal oscillator?
- Why a
normal oscillator like LC-tank circuit or an opamp circuit can't be used in
heterodyne receiver?
oscillator terminology
asked 8 hours ago
ShadowShadow
185312
$endgroup$
3
$begingroup$
The local oscillator is the one "local to", i.e., part of, your radio--as opposed to the remote oscillator used by the transmitter.
$endgroup$
– Hearth
8 hours ago
$begingroup$
An oscillator with an LC tank circuit can be a fine local oscillator in a heterodyne receiver. An opamp RC circuit will tend to be way too drifty and noisy, but you could try.
$endgroup$
– TimWescott
4 hours ago
add a comment |
$begingroup$
We know that a local oscillator (LO) is an electronic oscillator used with a mixer to change the frequency of a signal.
- But what do we mean by 'local'?
- How is 'local oscillator' different from normal oscillator?
- Why a
normal oscillator like LC-tank circuit or an opamp circuit can't be used in
heterodyne receiver?
oscillator terminology
asked 8 hours ago
ShadowShadow
185312
$endgroup$
We know that a local oscillator (LO) is an electronic oscillator used with a mixer to change the frequency of a signal.
- But what do we mean by 'local'?
- How is 'local oscillator' different from normal oscillator?
- Why a
normal oscillator like LC-tank circuit or an opamp circuit can't be used in
heterodyne receiver?
oscillator terminology
oscillator terminology
asked 8 hours ago
ShadowShadow
185312
asked 8 hours ago
ShadowShadow
185312
edited 8 hours ago
Shadow
asked 8 hours ago
ShadowShadow
185312
asked 8 hours ago
ShadowShadow
185312
asked 8 hours ago
ShadowShadow
185312
185312
3
$begingroup$
The local oscillator is the one "local to", i.e., part of, your radio--as opposed to the remote oscillator used by the transmitter.
$endgroup$
– Hearth
8 hours ago
$begingroup$
An oscillator with an LC tank circuit can be a fine local oscillator in a heterodyne receiver. An opamp RC circuit will tend to be way too drifty and noisy, but you could try.
$endgroup$
– TimWescott
4 hours ago
add a comment |
3
$begingroup$
The local oscillator is the one "local to", i.e., part of, your radio--as opposed to the remote oscillator used by the transmitter.
$endgroup$
– Hearth
8 hours ago
$begingroup$
An oscillator with an LC tank circuit can be a fine local oscillator in a heterodyne receiver. An opamp RC circuit will tend to be way too drifty and noisy, but you could try.
$endgroup$
– TimWescott
4 hours ago
3
3
$begingroup$
The local oscillator is the one "local to", i.e., part of, your radio--as opposed to the remote oscillator used by the transmitter.
$endgroup$
– Hearth
8 hours ago
$begingroup$
The local oscillator is the one "local to", i.e., part of, your radio--as opposed to the remote oscillator used by the transmitter.
$endgroup$
– Hearth
8 hours ago
$begingroup$
An oscillator with an LC tank circuit can be a fine local oscillator in a heterodyne receiver. An opamp RC circuit will tend to be way too drifty and noisy, but you could try.
$endgroup$
– TimWescott
4 hours ago
$begingroup$
An oscillator with an LC tank circuit can be a fine local oscillator in a heterodyne receiver. An opamp RC circuit will tend to be way too drifty and noisy, but you could try.
$endgroup$
– TimWescott
4 hours ago
add a comment |
3 Answers
3
active
oldest
votes
$begingroup$
You got that wrong:
The "local" in oscillator doesn't describe the kind of oscillator used. It could just be an LC-tank, it could be a crystal-derived oscillator, it could be something synthesized from a reference clock or something recovered from the data stream received:
The "local" in oscillator refers to the fact that it's what the mixer uses locally to mix down or up, as opposed to the oscillator at the other end of the communication, which simply isn't the same oscillator.
answered 8 hours ago
Marcus MüllerMarcus Müller
32.6k35895
$endgroup$
add a comment |
$begingroup$
Think of frequencies. The local oscillator generates a local frequency, that is only used by your mixer as the intermediate frequency. Whereas the transmitter frequency is not staying on your local board but flying through the air as radio waves. The transmitter and the receiver does not need to use the same intermediate frequency, but could use different local oscillators.
answered 8 hours ago
LundinLundin
3,8411131
$endgroup$
add a comment |
$begingroup$
LO to an RF Engineer means a sine signal "local" or "within the device" used for heterodyning or mixing.
answered 8 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
64.3k22294
$endgroup$
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
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votes
active
oldest
votes
$begingroup$
You got that wrong:
The "local" in oscillator doesn't describe the kind of oscillator used. It could just be an LC-tank, it could be a crystal-derived oscillator, it could be something synthesized from a reference clock or something recovered from the data stream received:
The "local" in oscillator refers to the fact that it's what the mixer uses locally to mix down or up, as opposed to the oscillator at the other end of the communication, which simply isn't the same oscillator.
answered 8 hours ago
Marcus MüllerMarcus Müller
32.6k35895
$endgroup$
add a comment |
$begingroup$
You got that wrong:
The "local" in oscillator doesn't describe the kind of oscillator used. It could just be an LC-tank, it could be a crystal-derived oscillator, it could be something synthesized from a reference clock or something recovered from the data stream received:
The "local" in oscillator refers to the fact that it's what the mixer uses locally to mix down or up, as opposed to the oscillator at the other end of the communication, which simply isn't the same oscillator.
answered 8 hours ago
Marcus MüllerMarcus Müller
32.6k35895
$endgroup$
add a comment |
$begingroup$
You got that wrong:
The "local" in oscillator doesn't describe the kind of oscillator used. It could just be an LC-tank, it could be a crystal-derived oscillator, it could be something synthesized from a reference clock or something recovered from the data stream received:
The "local" in oscillator refers to the fact that it's what the mixer uses locally to mix down or up, as opposed to the oscillator at the other end of the communication, which simply isn't the same oscillator.
answered 8 hours ago
Marcus MüllerMarcus Müller
32.6k35895
$endgroup$
You got that wrong:
The "local" in oscillator doesn't describe the kind of oscillator used. It could just be an LC-tank, it could be a crystal-derived oscillator, it could be something synthesized from a reference clock or something recovered from the data stream received:
The "local" in oscillator refers to the fact that it's what the mixer uses locally to mix down or up, as opposed to the oscillator at the other end of the communication, which simply isn't the same oscillator.
answered 8 hours ago
Marcus MüllerMarcus Müller
32.6k35895
answered 8 hours ago
Marcus MüllerMarcus Müller
32.6k35895
answered 8 hours ago
Marcus MüllerMarcus Müller
32.6k35895
answered 8 hours ago
Marcus MüllerMarcus Müller
32.6k35895
32.6k35895
add a comment |
add a comment |
$begingroup$
Think of frequencies. The local oscillator generates a local frequency, that is only used by your mixer as the intermediate frequency. Whereas the transmitter frequency is not staying on your local board but flying through the air as radio waves. The transmitter and the receiver does not need to use the same intermediate frequency, but could use different local oscillators.
answered 8 hours ago
LundinLundin
3,8411131
$endgroup$
add a comment |
$begingroup$
Think of frequencies. The local oscillator generates a local frequency, that is only used by your mixer as the intermediate frequency. Whereas the transmitter frequency is not staying on your local board but flying through the air as radio waves. The transmitter and the receiver does not need to use the same intermediate frequency, but could use different local oscillators.
answered 8 hours ago
LundinLundin
3,8411131
$endgroup$
add a comment |
$begingroup$
Think of frequencies. The local oscillator generates a local frequency, that is only used by your mixer as the intermediate frequency. Whereas the transmitter frequency is not staying on your local board but flying through the air as radio waves. The transmitter and the receiver does not need to use the same intermediate frequency, but could use different local oscillators.
answered 8 hours ago
LundinLundin
3,8411131
$endgroup$
Think of frequencies. The local oscillator generates a local frequency, that is only used by your mixer as the intermediate frequency. Whereas the transmitter frequency is not staying on your local board but flying through the air as radio waves. The transmitter and the receiver does not need to use the same intermediate frequency, but could use different local oscillators.
answered 8 hours ago
LundinLundin
3,8411131
answered 8 hours ago
LundinLundin
3,8411131
answered 8 hours ago
LundinLundin
3,8411131
answered 8 hours ago
LundinLundin
3,8411131
3,8411131
add a comment |
add a comment |
$begingroup$
LO to an RF Engineer means a sine signal "local" or "within the device" used for heterodyning or mixing.
answered 8 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
64.3k22294
$endgroup$
add a comment |
$begingroup$
LO to an RF Engineer means a sine signal "local" or "within the device" used for heterodyning or mixing.
answered 8 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
64.3k22294
$endgroup$
add a comment |
$begingroup$
LO to an RF Engineer means a sine signal "local" or "within the device" used for heterodyning or mixing.
answered 8 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
64.3k22294
$endgroup$
LO to an RF Engineer means a sine signal "local" or "within the device" used for heterodyning or mixing.
answered 8 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
64.3k22294
answered 8 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
64.3k22294
answered 8 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
64.3k22294
answered 8 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
64.3k22294
64.3k22294
add a comment |
add a comment |
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3
$begingroup$
The local oscillator is the one "local to", i.e., part of, your radio--as opposed to the remote oscillator used by the transmitter.
$endgroup$
– Hearth
8 hours ago
$begingroup$
An oscillator with an LC tank circuit can be a fine local oscillator in a heterodyne receiver. An opamp RC circuit will tend to be way too drifty and noisy, but you could try.
$endgroup$
– TimWescott
4 hours ago