公开(公告)号：US08902009B1

公开(公告)日：2014-12-02

申请号：US13661801

申请日：2012-10-26

Applicant: Marvell International Ltd.

Inventor： Fernando De Bernardinis ,  Luca Fanori ,  Antonio Liscidini

IPC: H03B5/12

CPC classification number: H03B5/1212 ,  H03B5/1215 ,  H03B5/1225 ,  H03B5/1228 ,  H03B5/1253 ,  H03B5/1265 ,  H03B2201/0283

Abstract: In one embodiment, an apparatus includes a first circuit of a digitally controlled oscillator (DCO). The first circuit has a loss component. A second circuit is coupled to the first circuit and configured to transform a positive impedance into a negative impedance in series with a negative resistance. The negative impedance includes an adjustable reactive component used to adjust a frequency of an output signal of the DCO. An equivalent reactance seen by the first circuit is less than a reactance of the adjustable reactive component.

Abstract translation: 在一个实施例中，装置包括数字控制振荡器（DCO）的第一电路。 第一个电路有一个损耗元件。 第二电路耦合到第一电路并且被配置为将正阻抗变换为与负电阻串联的负阻抗。 负阻抗包括用于调节DCO输出信号频率的可调无功分量。 由第一电路看到的等效电抗小于可调节的无功元件的电抗。

公开(公告)号：US5180991A

公开(公告)日：1993-01-19

申请号：US743813

申请日：1991-08-12

Applicant: Sumihiro Takashima

Inventor： Sumihiro Takashima

IPC: H03B1/00 ,  H03B5/20 ,  H03K3/027 ,  H03K3/03 ,  H03L7/00

CPC classification number: H03K3/03 ,  H03B5/20 ,  H03L7/00 ,  H03B2200/005 ,  H03B2201/0283 ,  H03J2200/10

Abstract: An RC oscillator for varying an oscillation frequency which has a counter for counting a clock pulse of the oscillation frequency and for outputting a counted value in a form of a plurality of bits to an output terminal. It also includes a standard capacitor, a plurality of capacitors having a capacitance value in proportion to a weight of bits outputted from the counter, and a plurality of switches connected to one end of each capacitor for selectively connecting the capacitors in parallel. A plurality of first gate circuits control the switches connected thereto in response to an output of the counter, each first gate circuit has an input terminal connected to an output terminal of the counter and an output terminal connected to a control terminal of the switches. A second gate circuit turns on the switches independently of the output of the counter in the case of a frequency adjustment of the oscillation signal, the second gate circuit has an input terminal connected to a predetermined output terminal of the counter and an output terminal connected to a switch for use of the standard capacitor.

Abstract translation: 一种用于改变振荡频率的RC振荡器，其具有用于对振荡频率的时钟脉冲进行计数的计数器，并将多个位的形式的计数值输出到输出端子。 它还包括标准电容器，具有与从计数器输出的位的重量成比例的电容值的多个电容器，以及连接到每个电容器的一端的多个开关，用于并联选择性地连接电容器。 多个第一门电路响应于计数器的输出控制连接到其上的开关，每个第一门电路具有连接到计数器的输出端的输入端和连接到开关的控制端的输出端。 在振荡信号的频率调整的情况下，第二门电路接通独立于计数器的输出的开关，第二门电路具有连接到计数器的预定输出端的输入端和连接到 用于标准电容器的开关。

公开(公告)号：US4331941A

公开(公告)日：1982-05-25

申请号：US126083

申请日：1980-02-29

Applicant: Al Kovalick ,  Rolly Hassun

Inventor： Al Kovalick ,  Rolly Hassun

IPC: H03B1/00 ,  H03B28/00 ,  H03C1/00 ,  H03C1/50

CPC classification number: H03C1/50 ,  H03B2201/0283 ,  H03B28/00 ,  H03C1/00

Abstract: A modulating signal is applied to an analog-to-digital converter which addresses a read-only memory phase look-up table. The read-only memory phase look-up table output is applied to a polarity generator. The polarity generator output and output from a phase accumulator are input to a phase adder. The phase adder output is applied to the input of a sine look-up read-only memory whose output is applied to a digital-to-analog converter and low-pass filtered to produce an amplitude-modulated carrier signal. The invention thereby digitally amplitude modulates a carrier signal in the phase domain without any multiplication being required.

Abstract translation: 调制信号被施加到寻址只读存储器相位查找表的模数转换器。 只读存储器相位查找表输出被应用于极性发生器。 来自相位累加器的极性发生器输出和输出被输入到相位加法器。 相位加法器输出被施加到正弦查找只读存储器的输入，其输出被施加到数模转换器，并且被低通滤波以产生幅度调制的载波信号。 因此，本发明在相位域中数字地幅度调制载波信号，而不需要任何乘法。

公开(公告)号：US3612773A

公开(公告)日：1971-10-12

申请号：US3612773D

申请日：1969-07-22

Applicant: BELL TELEPHONE LABOR INC

Inventor： RIEHM CHARLES E JR

IPC: H03B5/20 ,  H03B1/00 ,  H03B5/24 ,  H04M1/50 ,  H04M1/51

CPC classification number: H03B5/24 ,  H03B2201/0283 ,  H04M1/50

Abstract: Signal frequency combinations in a multifrequency signal generator are produced selectively by establishing conductive paths through switched insulated-gate field-effect transistors (IGFETS) to connect respective frequency determining elements into the oscillator circuits.

公开(公告)号：US08299862B1

公开(公告)日：2012-10-30

申请号：US12956641

申请日：2010-11-30

Applicant: Fernando De Bernardinis ,  Luca Fanori ,  Antonio Liscidini

Inventor： Fernando De Bernardinis ,  Luca Fanori ,  Antonio Liscidini

IPC: H03B5/12

CPC classification number: H03B5/1212 ,  H03B5/1215 ,  H03B5/1225 ,  H03B5/1228 ,  H03B5/1253 ,  H03B5/1265 ,  H03B2201/0283

Abstract: In one embodiment, an apparatus includes a first circuit of a digitally controlled oscillator (DCO). The first circuit has a loss component. A second circuit is coupled to the first circuit and configured to transform a positive impedance into a negative impedance in series with a negative resistance. The negative impedance includes an adjustable reactive component used to adjust a frequency of an output signal of the DCO. An equivalent reactance seen by the first circuit is less than a reactance of the adjustable reactive component.

Abstract translation: 在一个实施例中，装置包括数字控制振荡器（DCO）的第一电路。 第一个电路有一个损耗元件。 第二电路耦合到第一电路并且被配置为将正阻抗变换为与负电阻串联的负阻抗。 负阻抗包括用于调节DCO输出信号频率的可调无功分量。 由第一电路看到的等效电抗小于可调节的无功元件的电抗。

公开(公告)号：US20070182496A1

公开(公告)日：2007-08-09

申请号：US11551124

申请日：2006-10-19

Applicant: John Wallberg ,  Robert Staszewski ,  Vanessa Bodrero

Inventor： John Wallberg ,  Robert Staszewski ,  Vanessa Bodrero

IPC: H03B5/12

CPC classification number: G01R31/31727 ,  H03B2201/0283 ,  H03J2200/10

Abstract: A novel testing mechanism operative to test large capacitor arrays such as those used in a digitally controlled crystal oscillator (DCXO). The invention is adapted for use in DCXO circuits that employ dynamic element matching in their array decoding circuits. The invention combines the use of DEM during regular operation of the DCXO with a testing technique that greatly reduces the number of tests required. The invention tests the capacitors in the array on a row by row, wherein all the capacitors in a row are tested lumped together and treated as a single entity, which results in significantly reduced testing time. This permits the measurement of significantly higher frequency deviations due to the larger capacitances associated with an entire row of capacitors being tested

Abstract translation: 一种新颖的测试机制，用于测试诸如数字控制晶体振荡器（DCXO）中使用的大电容阵列。 本发明适用于在其阵列解码电路中采用动态元件匹配的DCXO电路中。 本发明结合了DCXO正常运行期间DEM的使用与大大减少所需测试次数的测试技术。 本发明逐行测试阵列中的电容器，其中一行中的所有电容器被集中测试并被处理为单个实体，这导致测试时间显着减少。 这允许由于与被测试的整个电容器相关联的较大电容而测量显着更高的频率偏差

公开(公告)号：US20050077972A1

公开(公告)日：2005-04-14

申请号：US10931173

申请日：2004-08-31

Applicant: Jurgen Oehm

Inventor： Jurgen Oehm

IPC: H03B1/00 ,  H03B5/12 ,  H03L7/00

CPC classification number: H03B5/1271 ,  H03B5/129 ,  H03B2201/0283

Abstract: A circuit arrangement for generating a reference current and also an oscillator circuit having the circuit arrangement are disclosed the arrangement includes a capacitance connected to an input of a voltage-controlled current source. Two amplifiers having different drive capabilities, between which a switching can be effected, are provided to drive the capacitance. An LC oscillator can be fed with the reference current in a current-controlled manner and at the same time in a particularly low-noise manner.

Abstract translation: 公开了一种用于产生参考电流的电路装置以及具有电路装置的振荡器电路，该装置包括连接到电压控制电流源的输入的电容。 提供具有不同驱动能力的两个放大器，其间可进行切换以驱动电容。 可以以电流控制的方式和同时以特别低噪声的方式将LC振荡器馈送到参考电流。

公开(公告)号：US5898345A

公开(公告)日：1999-04-27

申请号：US892201

申请日：1997-07-14

Applicant: Yasuaki Namura ,  Hideyuki Fukuda

Inventor： Yasuaki Namura ,  Hideyuki Fukuda

IPC: H03B1/00 ,  H03B5/12 ,  H03B5/32 ,  H03B5/36 ,  H03L1/02 ,  H03L7/099 ,  H03L7/189 ,  G03B5/00

CPC classification number: H03L7/189 ,  H03B5/368 ,  H03L1/025 ,  H03L7/099 ,  H03B2201/0208 ,  H03B2201/0283 ,  H03L2207/06

Abstract: A controllable-frequency oscillator has a first portion for generating a signal having a controllable frequency. The controllable-frequency oscillator has a second portion for controlling the frequency of the signal generated by the first portion in response to a first control signal. The controllable-frequency oscillator has a third portion for controlling the frequency of the signal generated by the first portion in response to a second control signal separate from the first control signal.

Abstract translation: 可控频率振荡器具有用于产生具有可控频率的信号的第一部分。 可控频率振荡器具有第二部分，用于响应于第一控制信号来控制由第一部分产生的信号的频率。 可控频率振荡器具有第三部分，用于响应于与第一控制信号分离的第二控制信号来控制由第一部分产生的信号的频率。

公开(公告)号：US5552748A

公开(公告)日：1996-09-03

申请号：US479299

申请日：1995-06-07

Applicant: Timothy G. O'Shaughnessy

Inventor： Timothy G. O'Shaughnessy

IPC: H03B1/00 ,  H03B5/20 ,  H03D13/00 ,  H03K3/03 ,  H03L7/00 ,  H03B5/24

CPC classification number: H03L7/00 ,  H03B5/20 ,  H03K3/03 ,  H03B2201/0283 ,  H03D13/004 ,  H03J2200/10

Abstract: A digitally-tuned oscillator (DTO) includes a digital-to-analog converter (DAC) and an RC oscillator. The RC oscillator includes an RC circuit for forming a time constant equal to the RC product. However, this RC time constant is not used in the manner of a typical RC network to set the frequency of oscillation. Instead, the RC oscillator disclosed herein includes a separate oscillator, such as a voltage-controlled oscillator (VCO), and uses the RC time constant to compare with the oscillator-generated period and to adjust the frequency of the overall RC oscillator circuit in accordance with the comparison. The RC oscillator is self-calibrating.

Abstract translation: 数字调谐振荡器（DTO）包括数模转换器（DAC）和RC振荡器。 RC振荡器包括用于形成等于RC积的时间常数的RC电路。 然而，这种RC时间常数不是以典型的RC网络的方式来设置振荡频率。 相反，本文公开的RC振荡器包括单独的振荡器，例如压控振荡器（VCO），并且使用RC时间常数来与振荡器产生的周期进行比较，并且根据RC振荡器电路的频率调整 与比较。 RC振荡器是自校准的。

公开(公告)号：US20070090884A1

公开(公告)日：2007-04-26

申请号：US11531004

申请日：2006-09-12

Applicant: Vanitha Kuppusamy ,  Clark Rogers

Inventor： Vanitha Kuppusamy ,  Clark Rogers

IPC: H03L7/00

CPC classification number: H03M1/0872 ,  H03B2200/0034 ,  H03B2200/0048 ,  H03B2201/0283 ,  H03L1/00 ,  H03M1/742

Abstract: Current sources are selectively coupled to a current controlled frequency determining circuit of an oscillator. A buffer amplifier has an input coupled to the current controlled frequency determining circuit of the oscillator and the buffer amplifier output is selectively coupled to the current sources not coupled to the frequency determining circuit of the oscillator. The buffer amplifier output maintains substantially the voltage of the current controlled frequency determining circuit on each of the current sources not coupled to the frequency determining circuit so that when any current source is coupled thereto, there is substantially no voltage difference therebetween. This substantially prevents generation of undesirable frequency spikes during coupling of the current sources to the frequency determining circuit of the oscillator.

Abstract translation: 电流源选择性地耦合到振荡器的电流控制频率确定电路。 缓冲放大器具有耦合到振荡器的电流控制频率确定电路的输入，并且缓冲放大器输出选择性地耦合到未耦合到振荡器的频率确定电路的电流源。 缓冲放大器输出基本上维持不耦合到频率确定电路的每个电流源上的电流控制频率确定电路的电压，使得当任何电流源耦合到其上时，它们之间基本上没有电压差。 这实质上防止了在将电流源耦合到振荡器的频率确定电路期间产生不期望的频率尖峰。