# US 11,121,787 B2 · Method, system and apparatus for calibration of phased array radio frequency transceiver

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- Number: US 11,121,787 B2
- Document ID: US11121787B2
- Status: Granted
- Kind: B2
- Application number: 16/568,285
- Filed: 2019-09-12
- Published: 2020-03-12
- Granted: 2021-09-14
- Earliest claimed: 2018-09-12
- Applicants: MMRFIC Technology Pvt. Ltd.
- Inventors: Ganesan Thiagarajan; Saravanakumar Ganeshan
- Web page: https://patentgrep.com/patent/US11121787B2

## CPC

- H04B 17/364: Delay profiles
- H04B 17/104: {of other parameters, e.g. DC offset, delay or propagation times}
- H04L 43/0858: {One way delays}
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A method of determining a total delay to a radio frequency (RF) signal caused by a path between a start point and an end point comprising, injecting a plurality of frequency tones at the start point, wherein the frequency tones are of different frequency, receiving the plurality of frequency tones at the end point, measuring a plurality phase differences corresponding to difference of phase between the plurality of frequency tones injected at the start point and the corresponding plurality of the frequency tones received at the end point, and determining a total delay to the RF signal caused by the path from at least more than one of the plurality of phase differences measured. The method further comprises determining a total phase shift to the RF signal from the total delay and a frequency of the RF signal.

## Claims

### Claim 1

A method of determining a total delay to a radio frequency (RF) signal caused by a path between a start point and an end point comprising:
injecting a plurality of frequency tones at the start point, wherein the frequency tones are of different frequency selected independent of length of the path;
receiving the plurality of frequency tones at the end point;
measuring a plurality phase differences corresponding to difference of phase between the plurality of frequency tones injected at the start point and the corresponding plurality of the frequency tones received at the end point;
determining a total delay to the RF signal caused by the path from at least more than one of the plurality of phase differences measured;
determining a total phase shift to the RF signal from the total delay and a frequency of the RF signal,
wherein the plurality of frequency tones are of frequencies f1, f2, f3, . . . fn and the plurality of corresponding phase differences are φ1, φ2, . . . φn, in that each phase difference φ1, φ2, . . . φn is less than 2π and the total delay is determined from a first relation:
[
-
1
0
0
0
…
f
1
0
-
1
0
0
…
f
2
⋮
0
0
0
-
1
…
f
n
]
⁡
[
m
1
m
2
⋮
m
n
τ
]
=
1
2
⁢
⁢
π
⁡
[
φ
1
φ
2
⋮
φ
n
]
,
in that, m1 through mn representing a number of wraps over 2π of the phase shift and are integers.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
selecting a first set of linear relation comprising at least more than one linear relation from the first relation to form a second relation comprising a first set of wraps, a first set of phase differences corresponding to first set of frequency tones;
selecting a first set of integer values for the first set of wraps; and
determining a first delay from the second relation by applying the first set of integer values.

### Claim 3 (depends on 2)

The method of claim 2, wherein the second relation is:
τ
1
=
2
⁢
⁢
π
⁡
(
m
1
-
m
2
)
+
(
φ
1
-
φ
2
)
(
2
⁢
⁢
π
⁢
⁢
f
1
)
-
(
2
⁢
⁢
π
⁢
⁢
f
2
)
in that, τ1 representing the first delay, f1 and f2 representing the first set of frequency tones, m1 and m2 representing the first set of wraps, and φ1, and φ2 representing the first set of phase differences.

### Claim 4 (depends on 3)

The method of claim 3, further comprising:
selecting a second set of linear relation comprising at least more than one linear relation from the first relation to form a third relation comprising a second set of wraps, a second set of phase differences corresponding to a second set of frequency tones;
selecting a second set of integer values for the second set of wraps; and
determining a second delay from the third relation by applying the second set of integer values to the second set of wraps.

### Claim 5 (depends on 4)

The method of claim 4, wherein the third relation is:
τ
2
=
2
⁢
⁢
π
⁡
(
m
3
-
m
4
)
+
(
φ
3
-
φ
4
)
(
2
⁢
⁢
π
⁢
⁢
f
3
)
-
(
2
⁢
⁢
π
⁢
⁢
f
4
)
in that, τ2 representing the second delay, f3 and f4 representing the second set of frequency tones, m3 and m4 representing the second set of wraps, and φ3, and φ4 representing the second set of phase differences.

### Claim 6 (depends on 5)

The method of claim 5, further comprising determining the total delay as mean of the first delay and the second delay.